bugfix: JKQTMathText: \sum and \prod used the wrong symbol in XITS-mode

NEW: JKQTMathText: \limits and \nolimits work as in LaTeX now (before it was simply removed and the functionality implemented for a fixed list of symbols) remove/breaking: JKQTMathText: \v[a-zA-Z] and shorthand for \vec{a-zA-Z} was removed improvement: improved typesetting of sub-/supercripts, especially for large math operators and braces
2024-12-25 01:51:49 +08:00 · 2022-06-26 00:28:49 +02:00 · 2022-06-26 00:28:49 +02:00 · 45d6ef373b
commit 45d6ef373b
parent f49714ecb6
21 changed files with 834 additions and 524 deletions
--- a/doc/dox/whatsnew.dox
+++ b/doc/dox/whatsnew.dox
@ -32,8 +32,11 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
    <li>FIXED: strikeoutPos was not correctly calculated in sub-/superscript node</li>
    <li>FIXED: symbol spacing in math mode (and text mode)</li>
    <li>FIXED/IMPROVED: JKQTMathText renders several LaTeX strings better (simple braces in math mode, +-*... as symbols with proper sizes in math mode, added some missing instruction aliases, improved size of \vec and \hat, corrrected fonts usage for mathrm</li>
+    <li>FIXED: \sum and \prod used the wrong symbol in XITS-mode</li>
    <li>IMPROVED: high-dpr-support in JKQTMathText</li>
+    <li>IMPROVED: typesetting of sub-/supercripts, especially for large math operators and braces</li>
    <li>MODIFIED: brace node  now calculates the extension of the child height above or below the strikeoutPos, in order to center braces around the strikeoutPos</li>
+    <li>remove/breaking: \v[a-zA-Z] and shorthand for \vec{a-zA-Z} was removed, implementation of \bbR,\bbC,... changed</li>
    <li>NEW: now supports new decoration instructions: \cancel, \xcancel, \bcancel, \sout, \ocirc, \widetilde, \widehat, \breve</li>
    <li>NEW: reworked drawing of decorations: improved appearance and positioning!</li>
    <li>NEW: reworked code structure: broke up large, single CPP-files into several smaller files!</li>
@ -42,6 +45,7 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
    <li>NEW: shows strikeoutPos when drawing Debug-Boxes</li>
    <li>NEW: LaTeX-Parser understands optional instruction parameters in [...] now</li>
    <li>NEW: LaTeX-Parser simplifies parrse-tree to increase speed of execution</li>
+    <li>NEW: \limits and \nolimits works as in LaTeX now (before it was simply removed and the functionality implemented for a fixed list of symbols)</li>
  </ul>
 </ul>

--- a/doc/images/jkqtmathtext/jkqtmathtext_specialsubscriptnode_getSizeInternal.cdr
+++ b/doc/images/jkqtmathtext/jkqtmathtext_specialsubscriptnode_getSizeInternal.cdr
--- a/doc/images/jkqtmathtext/jkqtmathtext_specialsubscriptnode_getSizeInternal.png
+++ b/doc/images/jkqtmathtext/jkqtmathtext_specialsubscriptnode_getSizeInternal.png
--- a/doc/images/jkqtmathtext/jkqtmathtext_specialsuperscriptnode_getSizeInternal.cdr
+++ b/doc/images/jkqtmathtext/jkqtmathtext_specialsuperscriptnode_getSizeInternal.cdr
--- a/doc/images/jkqtmathtext/jkqtmathtext_specialsuperscriptnode_getSizeInternal.png
+++ b/doc/images/jkqtmathtext/jkqtmathtext_specialsuperscriptnode_getSizeInternal.png
--- a/doc/images/jkqtmathtext/jkqtmathtext_subsuper_with_limits.cdr
+++ b/doc/images/jkqtmathtext/jkqtmathtext_subsuper_with_limits.cdr
--- a/doc/images/jkqtmathtext/jkqtmathtext_subsuper_with_limits.png
+++ b/doc/images/jkqtmathtext/jkqtmathtext_subsuper_with_limits.png
--- a/doc/images/jkqtmathtext/jkqtmathtext_superscriptnode_getSizeInternal.cdr
+++ b/doc/images/jkqtmathtext/jkqtmathtext_superscriptnode_getSizeInternal.cdr
--- a/examples/jkqtmathtext_test/mathtest.pdf
+++ b/examples/jkqtmathtext_test/mathtest.pdf
--- a/examples/jkqtmathtext_test/mathtest.tex
+++ b/examples/jkqtmathtext_test/mathtest.tex
@ -130,6 +130,7 @@
 		    \item\textbf{math: long non-2 radicals:} \[Hxq \sqrt[3.14156]{a}\sqrt[3.14156]{5}\]
 		    \item\textbf{math: sum, prod, ...:} no-limits: \[Hxq \prod_{i=1}^n \sum_{j=1}^c (i + j)\cdot\frac{1}{2}\]\ \ \ --\ \ \ limits: \[Hxq \prod\limits_{i=1}^n \sum\limits_{j=1}^c (i + j)\cdot\frac{1}{2}\]\ \ \ --\ \ \ long-below: \[\sum_{n=\{a,b,c,d,e,f,g\}} f(x)\]\ \ \ --\ \ \ long-above: \[\sum^{n=\{a,b,c,d,e,f,g\}} f(x)\]
 		    \item\textbf{math: more sum-symbols :} \[Hxq \sum_{i=0}^N\prod_{i=0}^N\coprod_{i=0}^N\bigcup_{i=0}^N\bigcap_{i=0}^N\bigsqcup_{i=0}^N\bigvee_{i=0}^N\bigwedge_{i=0}^N\bigoplus_{i=0}^N\bigotimes_{i=0}^N\bigodot_{i=0}^N\biguplus_{i=0}^N\]
+		    \item\textbf{math: more sum-symbols, no-limits :} $Hxq \sum_{i=0}^N\prod_{i=0}^N\coprod_{i=0}^N\bigcup_{i=0}^N\bigcap_{i=0}^N\bigsqcup_{i=0}^N\bigvee_{i=0}^N\bigwedge_{i=0}^N\bigoplus_{i=0}^N\bigotimes_{i=0}^N\bigodot_{i=0}^N\biguplus_{i=0}^N$
 		    \item\textbf{math: integrals:} no-limits: \[Hxq \int_{0}^1 f(x)\;\mathrm{d}x\ \iint_{0}^1 f(x)\;\mathrm{d}x\ \iiint_{0}^1 f(x)\;\mathrm{d}x\ \oint_{0}^1 f(x)\;\mathrm{d}x\ \int_{x} f(x)\;\mathrm{d}x\]\ \ \ --\ \ \ limits: \[\int\limits_{0}^1 f(x)\;\mathrm{d}x\ \iint\limits_{0}^1 f(x)\;\mathrm{d}x\ \iiint\limits_{0}^1 f(x)\;\mathrm{d}x\ \oint\limits_{0}^1 f(x)\;\mathrm{d}x\ \int\limits_{x} f(x)\;\mathrm{d}x\]
 		    \item\textbf{math: frac test:} \[\frac{a}{b}+\frac{g}{a}-\frac{a^2}{b^2}\cdot\frac{a^2}{b^{\frac{1}{2}}}\]
 		\item\textbf{sfrac:} Hxq \sfrac{1}{2} \ \ -- \ \  $Hxq \frac{1}{2}\ \ \sfrac{1}{2}\ \ \frac{1}{2+\frac{1}{2}}\ \ \sfrac{1}{2+\sfrac{1}{2}}\ \ \sfrac{1}{2+\frac{1}{2}}\ \ \sfrac{\frac{1}{2+\frac{1}{2}}}{2}\ \ e^{\sfrac{1}{2}}$
--- a/examples/jkqtmathtext_test/testform.cpp
+++ b/examples/jkqtmathtext_test/testform.cpp
@ -34,15 +34,15 @@ TestForm::TestForm(QWidget *parent) :
    ui->cmbTestset->addItem("math: std dev", "$\\sigma_x=\\sqrt{\\langle (x-\\langle x\\rangle)^2\\rangle}=\\sqrt{\\frac{1}{N-1}\\cdot\\left( \\sum_{i=1}^N{x_i}^2-\\frac{1}{N}\\cdot\\left(\\sum_{i=1}^Nx_i\\right)^2\\right)}$");
    ui->cmbTestset->addItem("math: std dev 2", "$\\sigma_x=\\sqrt{\\langle (x-\\langle x\\rangle)^2\\rangle}=\\sqrt{\\frac{1}{N-1}\\cdot\\left( \\sum_{i=1}^Nx_i^2-\\frac{1}{N}\\cdot\\left(\\sum_{i=1}^Nx_i\\right)^2\\right)}$");
    ui->cmbTestset->addItem("math: rotation matrix", "$\\mathrm{\\mathbf{M}}(\\alpha) = \\left(\\begin{matrix}\\cos(\\alpha)+n_x^2\\cdot (1-\\cos(\\alpha))  &  n_x\\cdot n_y\\cdot (1-\\cos(\\alpha))-n_z\\cdot \\sin(\\alpha) &  n_x\\cdot n_z\\cdot (1-\\cos(\\alpha))+n_y\\cdot \\sin(\\alpha)\\\\n_x\\cdot n_y\\cdot (1-\\cos(\\alpha))+n_z\\cdot \\sin(\\alpha) & \\cos(\\alpha)+n_y^2\\cdot (1-\\cos(\\alpha))  &   n_y\\cdot n_z\\cdot (1-\\cos(\\alpha))-n_x\\cdot \\sin(\\alpha)\\\\n_z\\cdot n_x\\cdot (1-\\cos(\\alpha))-n_y\\cdot \\sin(\\alpha) & n_z\\cdot n_y\\cdot (1-\\cos(\\alpha))+n_x\\cdot \\sin(\\alpha)  & \\cos(\\alpha)+n_z^2\\cdot (1-\\cos(\\alpha))\\end{matrix}\\right)$");
-    ui->cmbTestset->addItem("text: like in label at bottom)", "\\left(\\left[\\sqrt{2\\pi\\cdot\\int_{-\\infty}^\\infty f(x)\\;\\mathrm{d}x}\\right]\\right)");
    ui->cmbTestset->addItem("math: like in label at bottom", "$\\left(\\left[\\sqrt{2\\pi\\cdot\\int_{-\\infty}^\\infty f(x)\\;\\mathrm{d}x}\\right]\\right)$");
+    ui->cmbTestset->addItem("text: like in label at bottom)", "\\left(\\left[\\sqrt{2\\pi\\cdot\\int_{-\\infty}^\\infty f(x)\\;\\mathrm{d}x}\\right]\\right)");
    ui->cmbTestset->addItem("text 0", "text");
    ui->cmbTestset->addItem("text 1", "text \\mathbf{bold}");
    ui->cmbTestset->addItem("text 2", "text \\mathbf{bold}\\textcolor{red}{RED}");
    const auto mathDecoExample=[](const QString& deco)->QString { return "\\"+deco+"{x}\\"+deco+"{i}\\"+deco+"{X}\\"+deco+"{\\psi}\\"+deco+"{abc}"; };
    ui->cmbTestset->addItem("decoration: math", "$"+mathDecoExample("vec")+" -- "+mathDecoExample("dot")+" -- "+mathDecoExample("ddot")+" -- "+mathDecoExample("ocirc")+" -- "+mathDecoExample("overline")+" -- "+mathDecoExample("underline")+" -- "+mathDecoExample("hat")+" -- "+mathDecoExample("widehat")+" -- "+mathDecoExample("check")+" -- "+mathDecoExample("widecheck")+" -- "+mathDecoExample("breve")+" -- "+mathDecoExample("tilde")+" -- "+mathDecoExample("widetilde")+" -- "+mathDecoExample("uul")+" -- "+mathDecoExample("ool")+" -- "+mathDecoExample("bar")+" -- "+mathDecoExample("arrow")+" -- "+mathDecoExample("cancel")+" -- "+mathDecoExample("bcancel")+" -- "+mathDecoExample("xcancel")+" -- "+mathDecoExample("sout")+"$");
    ui->cmbTestset->addItem("decoration: text", "Text \\ul{underlined Text Equator} -- \\ol{overlined Text Equator} -- \\sout{striked out Text Equator} -- \\cancel{canceled out Text Equator} -- \\bcancel{b-canceled out Text Equator} -- \\xcancel{x-canceled out Text Equator}");
-    ui->cmbTestset->addItem("mathtest", "This is normal text: $this is math:\\langle r^2(\\tau)\\rangle=\\left\\langle (\\vec{r}(t)-\\vec{r}(t+\\tau) )^2\\right\\rangle\\ \\ \\ g(\\tau)=\\frac{1}{N}\\cdot\\left(1+\\frac{2}{3}\\frac{\\langle r^2(\\tau)\\rangle}{w_{xy}^2}\\right)^{-1}  \\lfloor\\rfloor\\lceil\\rceil\\langle\\rangle\\left\\{\\va\\left|\\|\\va\\|_2\\geq2\\right.\\right\\} \\vr\\vR\\frac{\\sqrt{\\sqrt{\\sqrt{\\sum_{i=0}^\\infty \\hat{i}^2}+y^\\alpha}+1}}{\\dot{v}\\equiv\\ddot{r}}\\argmin_{\\vec{k}}\\sum_{\\sqrt{i}=0}^{N}\\int_{x_0}^{x_1}\\left(\\left(\\left(x\\right)\\right)\\right)\\underbrace{\\left[\\left\\{\\frac{\\partial f}{\\partial x}\\right\\}\\cdot\\frac{1}{2}\\right]}{\\text{underbraced text \\hbar}}\\cdots\\frac{\\sqrt{\\sum_{i=0}^2 \\hat{i}^2}+y^\\alpha}{\\dot{v}\\equiv\\ddot{r}}, \\hat{t}\\hat{T} \\overbrace{\\left|\\sqrt{x\\cdot Y}\\right|}{\\propto\\bbN\\circ\\bbZ}   \\left<\\arrow{x(\\tau)}\\cdot\\vec{R}(t+\\bar{\\tau})\\right>   \\alpha\\beta\\gamma\\delta\\epsilon\\Gamma\\Delta\\Theta\\Omega  \\left\\_\\left~\\cbrt{\\hbar\\omega}\\right~\\right\\_$");
+    ui->cmbTestset->addItem("mathtest", "This is normal text: $this is math:\\langle r^2(\\tau)\\rangle=\\left\\langle (\\vec{r}(t)-\\vec{r}(t+\\tau) )^2\\right\\rangle\\ \\ \\ g(\\tau)=\\frac{1}{N}\\cdot\\left(1+\\frac{2}{3}\\frac{\\langle r^2(\\tau)\\rangle}{w_{xy}^2}\\right)^{-1}  \\lfloor\\rfloor\\lceil\\rceil\\langle\\rangle\\left\\{\\vec{a}\\left|\\|\\vec{a}\\|_2\\geq2\\right.\\right\\} \\vec{r}\\vec{R}\\frac{\\sqrt{\\sqrt{\\sqrt{\\sum_{i=0}^\\infty \\hat{i}^2}+y^\\alpha}+1}}{\\dot{v}\\equiv\\ddot{r}}\\argmin_{\\vec{k}}\\sum_{\\sqrt{i}=0}^{N}\\int_{x_0}^{x_1}\\left(\\left(\\left(x\\right)\\right)\\right)\\underbrace{\\left[\\left\\{\\frac{\\partial f}{\\partial x}\\right\\}\\cdot\\frac{1}{2}\\right]}{\\text{underbraced text \\hbar}}\\cdots\\frac{\\sqrt{\\sum_{i=0}^2 \\hat{i}^2}+y^\\alpha}{\\dot{v}\\equiv\\ddot{r}}, \\hat{t}\\hat{T} \\overbrace{\\left|\\sqrt{x\\cdot Y}\\right|}{\\propto\\bbN\\circ\\bbZ}   \\left<\\arrow{x(\\tau)}\\cdot\\vec{R}(t+\\bar{\\tau})\\right>   \\alpha\\beta\\gamma\\delta\\epsilon\\Gamma\\Delta\\Theta\\Omega  \\left\\_\\left~\\cbrt{\\hbar\\omega}\\right~\\right\\_$");
    ui->cmbTestset->addItem("math: upper/lower parantheses test:", "$\\text{bblabla} \\frac{1}{2}\\cdot\\left(\\frac{1}{\\mathrm{e}^x+\\mathrm{e}^{-x}}\\right)\\cdot\\left(\\frac{1}{\\frac{1+2}{5+x}}\\right)\\cdot\\left(\\frac{1}{\\exp\\left[-\\frac{y^2}{\\sqrt{x}}\\right]\\cdot\\exp\\left[-\\frac{1}{\\frac{1}{2}}\\right]}\\right) $");
    ui->cmbTestset->addItem("math: ACF test", "$g_{rg}^{ab}(\\tau)=\\frac{1}{N}\\cdot\\left(1+\\frac{2}{3}\\frac{\\langle r^2(\\tau)\\rangle}{w_{xy}^2}\\right)^{-1}\\cdot\\left(1+\\frac{2}{3}\\frac{\\langle r^2(\\tau)\\rangle}{w_{xy}^2}\\right)^{-\\frac{1}{2}}$");
    ui->cmbTestset->addItem("math: MSD test", "$\\mathrm{MSD}(\\tau)\\equiv\\langle r^2(\\tau)\\rangle=\\left\\langle (\\vec{r}(t)-\\vec{r}(t+\\tau) )^2\\right\\rangle=2n\\cdot\\frac{K_\\alpha}{\\Gamma(1+\\alpha)}\\cdot\\tau^\\alpha$");
@ -92,11 +92,11 @@ TestForm::TestForm(QWidget *parent) :
    ui->cmbTestset->addItem("text: non-2 radicals", "\\sqrt[3]{a}\\sqrt[3]{5}\\sqrt[3]{-1}\\sqrt[3]{h}\\sqrt[3]{\\vec{A}}\\sqrt[3]{\\frac{1}{a}}\\frac{\\sqrt[3]{a}}{\\sqrt[3]{a}}\\sqrt[3]{\\frac{1}{1+\\frac{1}{a}}}\\frac{1}{\\sqrt[3]{1+\\frac{1}{a}}}\\sqrt[3]{a+\\sqrt[3]{a+b}}");
    ui->cmbTestset->addItem("math: long non-2 radicals", "$\\sqrt[3.14156]{a}\\sqrt[3.14156]{5}$");
    ui->cmbTestset->addItem("text: long non-2 radicals", "\\sqrt[3.14156]{a}\\sqrt[3.14156]{5}");
-    ui->cmbTestset->addItem("math: sum, prod, ...", "no-limits: $\\prod_{i=1}^n \\sum_{j=1}^c (i + j)\\cdot\\frac{1}{2}$\\ \\ \\ --\\ \\ \\ limits: $\\prod\\limits_{i=1}^n \\sum\\limits_{j=1}^c (i + j)\\cdot\\frac{1}{2}$\\ \\ \\ --\\ \\ \\ long-below: $\\sum_{n=\\{a,b,c,d,e,f,g\\}} f(x)$\\ \\ \\ --\\ \\ \\ long-above: $\\sum^{n=\\{a,b,c,d,e,f,g\\}} f(x)$");
-    ui->cmbTestset->addItem("text: sum, prod, ...", "no-limits: \\prod_{i=1}^n \\sum_{j=1}^c (i + j)\\cdot\\frac{1}{2}\\ \\ \\ --\\ \\ \\ limits: \\prod\\limits_{i=1}^n \\sum\\limits_{j=1}^c (i + j)\\cdot\\frac{1}{2}\\ \\ \\ --\\ \\ \\ long-below: \\sum_{n=\\{a,b,c,d,e,f,g\\}} f(x)\\ \\ \\ --\\ \\ \\ long-above: \\sum^{n=\\{a,b,c,d,e,f,g\\}} f(x)");
-    ui->cmbTestset->addItem("math: more sum-symbols ", "$\\sum_{i=0}^N\\prod_{i=0}^N\\coprod_{i=0}^N\\bigcup_{i=0}^N\\bigcap_{i=0}^N\\bigsqcup_{i=0}^N\\bigvee_{i=0}^N\\bigwedge_{i=0}^N\\bigoplus_{i=0}^N\\bigotimes_{i=0}^N\\bigodot_{i=0}^N\\biguplus_{i=0}^N$");
-    ui->cmbTestset->addItem("math: integrals", "no-limits: $\\int_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int_{x} f(x)\\;\\mathrm{d}x$\\ \\ \\ --\\ \\ \\ limits: $\\int\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int\\limits_{x} f(x)\\;\\mathrm{d}x$");
-    ui->cmbTestset->addItem("text: integrals", "no-limits: \\int_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int_{x} f(x)\\;\\mathrm{d}x$\\ \\ \\ --\\ \\ \\ limits: $\\int\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int\\limits_{x} f(x)\\;\\mathrm{d}x");
+    ui->cmbTestset->addItem("math: sum, prod, ... bare/+\\nolimits", "no-limits: $\\prod\\nolimits_{i=1}^n \\sum\\nolimits_{j=1}^c (i + j)\\cdot\\frac{1}{2}$\\ \\ \\ --\\ \\ \\ bare: $\\prod_{i=1}^n \\sum_{j=1}^c (i + j)\\cdot\\frac{1}{2}$\\ \\ \\ --\\ \\ \\ long-below, bare: $\\sum_{n=\\{a,b,c,d,e,f,g\\}} f(x)$\\ \\ \\ --\\ \\ \\ long-above, bare: $\\sum^{n=\\{a,b,c,d,e,f,g\\}} f(x)$");
+    ui->cmbTestset->addItem("text: sum, prod, ... bare/+\\limits", "bare: \\prod_{i=1}^n \\sum_{j=1}^c (i + j)\\cdot\\frac{1}{2}\\ \\ \\ --\\ \\ \\ limits: \\prod\\limits_{i=1}^n \\sum\\limits_{j=1}^c (i + j)\\cdot\\frac{1}{2}\\ \\ \\ --\\ \\ \\ long-below, bare: \\sum_{n=\\{a,b,c,d,e,f,g\\}} f(x)\\ \\ \\ --\\ \\ \\ long-above, bare: \\sum^{n=\\{a,b,c,d,e,f,g\\}} f(x)");
+    ui->cmbTestset->addItem("math: more sum-symbols ", "$\\sum\\limits_{i=0}^N\\prod\\limits_{i=0}^N\\coprod\\limits_{i=0}^N\\bigcup\\limits_{i=0}^N\\bigcap\\limits_{i=0}^N\\bigsqcup\\limits_{i=0}^N\\bigvee\\limits_{i=0}^N\\bigwedge\\limits_{i=0}^N\\bigoplus\\limits_{i=0}^N\\bigotimes\\limits_{i=0}^N\\bigodot\\limits_{i=0}^N\\biguplus\\limits_{i=0}^N$");
+    ui->cmbTestset->addItem("math: integrals+sums, bare/+\\nolimits", "bare: $\\int_{0}^1 f(x)\\;\\mathrm{d}x\\ \\sum_{x=0}^1f(x)\\ \\iint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int_{x} f(x)\\;\\mathrm{d}x$\\ \\ \\ --\\ \\ \\ nolimits: $\\int\\nolimits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\sum\\nolimits_{x=0}^1f(x)\\ \\iint\\nolimits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint\\nolimits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint\\nolimits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int\\nolimits_{x} f(x)\\;\\mathrm{d}x$");
+    ui->cmbTestset->addItem("text: integrals+sums, bare/+\\limits", "bare: \\int_{0}^1 f(x)\\;\\mathrm{d}x\\ \\sum_{x=0}^1f(x)\\ \\iint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int_{x} f(x)\\;\\mathrm{d}x$\\ \\ \\ --\\ \\ \\ limits: $\\int\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\sum\\limits_{x=0}^1f(x)\\ \\iint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\iiint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\oint\\limits_{0}^1 f(x)\\;\\mathrm{d}x\\ \\int\\limits_{x} f(x)\\;\\mathrm{d}x");
    ui->cmbTestset->addItem("math: frac test", "$\\frac{a}{b}+\\frac{g}{a}-\\frac{a^2}{b^2}\\cdot\\frac{a^2}{b^{\\frac{1}{2}}}$");
    ui->cmbTestset->addItem("math/text: stacked frac", "math: $\\frac{1+\\frac{a}{b}}{1+\\frac{1}{1+\\frac{1}{a}}}$\\ \\ text: \\frac{1+\\frac{a}{b}}{1+\\frac{1}{1+\\frac{1}{a}}}\\ \\ \\ \\ \\ --\\ \\ \\ \\ \\ math: $a_0+\\cfrac{1}{a_1+\\cfrac{1}{a_2+\\cfrac{1}{a_3+\\cdots}}}$\\ \\ text: a_0+\\cfrac{1}{a_1+\\cfrac{1}{a_2+\\cfrac{1}{a_3+\\cdots}}}");
    ui->cmbTestset->addItem("math: tfrac test", "$\\tfrac{a}{b}+\\tfrac{g}{a}-\\tfrac{a^2}{b^2}\\cdot\\tfrac{a^2}{b^{\\tfrac{1}{2}}}$");
@ -217,7 +217,7 @@ TestForm::TestForm(QWidget *parent) :

    ui->cmbTestset->setCurrentIndex(0);

-    ui->labMath->setMath("\\left(\\left[\\sqrt{2\\pi\\cdot\\int_{-\\infty}^\\infty f(x)\\;\\mathrm{d}x}\\right]\\right)");
+    ui->labMath->setMath("$\\left(\\left[\\sqrt{2\\pi\\cdot\\int_{-\\infty}^\\infty f(x)\\;\\mathrm{d}x}\\right]\\right)$");
    ui->cmbFont->setCurrentIndex(1);

    connect(ui->chkBoxes, SIGNAL(toggled(bool)), this, SLOT(updateMath()));
@ -268,7 +268,7 @@ TestForm::~TestForm()



-double TestForm::draw(QPainter& painter, double X, double YY, JKQTMathText& mt, QString name, double& durationSizingMS, double&durationTimingMS) {
+double TestForm::draw(QPainter& painter, double X, double YY, JKQTMathText& mt, QString name, double& durationSizingMS, double&durationTimingMS, QStringList* lstErrors) {


    double Y=YY;
@ -298,6 +298,7 @@ double TestForm::draw(QPainter& painter, double X, double YY, JKQTMathText& mt,
    qDebug()<<"   drawing in "<<durationTimingMS<<" ms";
    p.setColor("blue");
    painter.setPen(p);
+    if (lstErrors) *lstErrors=mt.getErrorList();

    QFont f;
    f.setFamily("sans serif");
@ -364,7 +365,7 @@ QTreeWidgetItem *TestForm::createTree(JKQTMathTextNode *node, QTreeWidgetItem* p
        name=QString("MTsubscriptNode");
        if (subN->getChild()) ti->addChild(createTree(subN->getChild(), ti));
    } else if (inst1N)  {
-        name=QString("MTinstruction1Node: \'%1\'").arg(inst1N->getName());
+        name=QString("MTinstruction1Node: \'%1\' (subsuper=%2").arg(inst1N->getName()).arg(inst1N->isSubSuperscriptAboveBelowNode());
        if (inst1N->getChild()) ti->addChild(createTree(inst1N->getChild(), ti));
    } else if (lstN)  {
        name=QString("MTlistNode");
@ -373,7 +374,7 @@ QTreeWidgetItem *TestForm::createTree(JKQTMathTextNode *node, QTreeWidgetItem* p
            ti->addChild(createTree(list[i], ti));
        }
    } else if (symN)  {
-        name=QString("MTSymbolNode: \'%1\' (addWhite: %2)").arg(symN->getSymbolName()).arg(symN->getAddWhitespace());
+        name=QString("MTSymbolNode: \'%1\' (addWhite: %2, subsuper=%3)").arg(symN->getSymbolName()).arg(symN->getAddWhitespace()).arg(symN->isSubSuperscriptAboveBelowNode());
    } else if (spN)  {
        name=QString("MTWhitespaceNode :\'%1\'").arg(txtN->getText());
    } else if (txtN)  {
@ -445,24 +446,36 @@ void TestForm::updateMath()
    ht.start();


+    if (ui->cmbFont->currentIndex()<=3) {
+        mt.setFontRoman(ui->cmbUnicodeSerif->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSerif->currentIndex()));
+        mt.setFontSans(ui->cmbUnicodeSans->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSans->currentIndex()));
+        mt.setFontMathRoman(ui->cmbUnicodeSerifMath->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSerifMath->currentIndex()));
+        mt.setFontMathSans(ui->cmbUnicodeSansMath->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSansMath->currentIndex()));
+        mt.setFontTypewriter(ui->cmbUnicodeFixed->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingTypewriter->currentIndex()));
+        mt.setFontCaligraphic(ui->cmbCaligraphic->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingCaligraphic->currentIndex()));
+        mt.setFontScript(ui->cmbScript->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingScript->currentIndex()));
+        mt.setFontFraktur(ui->cmbUnicodeFraktur->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingFraktur->currentIndex()));
+        mt.setFontBlackboard(ui->cmbUnicodeBlackboard->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingBlackboard->currentIndex()));
+        mt.setSymbolfontSymbol(ui->cmbUnicodeSymbol->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSymbol->currentIndex()));
+        mt.setSymbolfontGreek(ui->cmbUnicodeGreek->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingGreek->currentIndex()));
+    } else if (ui->cmbFont->currentIndex()==5 || ui->cmbFont->currentIndex()==6) {
+        mt.setFontRoman(QGuiApplication::font().family());
+    } else if (ui->cmbFont->currentIndex()==7) {
+        mt.useAnyUnicode("Times New Roman", "Times New Roman");
+    } else if (ui->cmbFont->currentIndex()==8) {
+        mt.useAnyUnicode("Arial", "Arial");
+    } else if (ui->cmbFont->currentIndex()==9) {
+        mt.useAnyUnicode("Courier New", "Courier New");
+    } else if (ui->cmbFont->currentIndex()==10) {
+        mt.useAnyUnicode("Comic Sans MS", "Comic Sans MS");
+    }

-    mt.setFontRoman(ui->cmbUnicodeSerif->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSerif->currentIndex()));
-    mt.setFontSans(ui->cmbUnicodeSans->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSans->currentIndex()));
-    mt.setFontMathRoman(ui->cmbUnicodeSerifMath->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSerifMath->currentIndex()));
-    mt.setFontMathSans(ui->cmbUnicodeSansMath->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSansMath->currentIndex()));
-    mt.setFontTypewriter(ui->cmbUnicodeFixed->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingTypewriter->currentIndex()));
-    mt.setFontCaligraphic(ui->cmbCaligraphic->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingCaligraphic->currentIndex()));
-    mt.setFontScript(ui->cmbScript->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingScript->currentIndex()));
-    mt.setFontFraktur(ui->cmbUnicodeFraktur->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingFraktur->currentIndex()));
-    mt.setFontBlackboard(ui->cmbUnicodeBlackboard->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingBlackboard->currentIndex()));
-    mt.setSymbolfontSymbol(ui->cmbUnicodeSymbol->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingSymbol->currentIndex()));
-    mt.setSymbolfontGreek(ui->cmbUnicodeGreek->currentFont().family(), static_cast<JKQTMathTextFontEncoding>(ui->cmbEncodingGreek->currentIndex()));
    mt.setFontBlackboardSimulated(ui->chkSimulateBlackboard->isChecked());

    if (ui->cmbFont->currentIndex()==1) qDebug()<<"useXITS: "<<mt.useXITS();
    else if (ui->cmbFont->currentIndex()==2) qDebug()<<"useSTIX: "<<mt.useSTIX();
    else if (ui->cmbFont->currentIndex()==3) qDebug()<<"useASANA: "<<mt.useASANA();
-
+    else if (ui->cmbFont->currentIndex()==6) qDebug()<<"useXITS: "<<mt.useXITS();
    ui->tree->clear();
    ht.start();
    double durationParse=0;
@ -490,18 +503,21 @@ void TestForm::updateMath()
        Y+=draw(painter, X1, Y, mt, QString("%1, %2, %3pt").arg(ui->cmbTestset->currentText()).arg(ui->cmbFont->currentText()).arg(size), durationSizingMS, durationTimingMS);

        if (i==0) {
+            ui->labError->clear();
            if (mt.getErrorList().size()>0) {
-                ui->labError->setText("<span color=\"red\">"+mt.getErrorList().join("<br>")+"</span>");
+                ui->labError->setHtml("<span color=\"red\">"+mt.getErrorList().join("<br>")+"</span>");
            } else {
-                ui->labError->setText("<span color=\"green\">OK</span>");
+                ui->labError->setHtml("<span color=\"green\">OK</span>");
            }
        }

        ui->labRenderTimes->setText(ui->labRenderTimes->text()+QString("     %1pt: %2ms/%3ms").arg(size).arg(durationSizingMS, 0, 'F', 1).arg(durationTimingMS, 0, 'F', 1));
-        ui->textBrowser->textCursor().insertHtml("<hr>"+mt.toHtml(&okh)+"<hr><br><br>");
-        qDebug()<<"HTML: ---------------------------------------------\n"<<mt.toHtml(&okh)<<"\nHTML: --------------------------------------------- ok="<<okh;
-        if (mt.getErrorList().size()>0) {
-            qDebug()<<mt.getErrorList().join("\n")<<"\n";
+        if (i==0) {
+            ui->textBrowser->textCursor().insertHtml("<hr>"+mt.toHtml(&okh)+"<hr><br><br>");
+            qDebug()<<"HTML: ---------------------------------------------\n"<<mt.toHtml(&okh)<<"\nHTML: --------------------------------------------- ok="<<okh;
+            if (mt.getErrorList().size()>0) {
+                qDebug()<<mt.getErrorList().join("\n")<<"\n";
+            }
        }
    }

--- a/examples/jkqtmathtext_test/testform.h
+++ b/examples/jkqtmathtext_test/testform.h
@ -27,7 +27,7 @@ class TestForm : public QWidget
    private:
        Ui::TestForm *ui;
        JKQTPHighResTimer ht;
-        double draw(QPainter& painter, double X, double YY, JKQTMathText& mt, QString name, double &durationSizingMS, double &durationTimingMS);
+        double draw(QPainter& painter, double X, double YY, JKQTMathText& mt, QString name, double &durationSizingMS, double &durationTimingMS, QStringList *lstErrors=nullptr);

        QTreeWidgetItem* createTree(JKQTMathTextNode* node, QTreeWidgetItem *parent=NULL);
 };
--- a/examples/jkqtmathtext_test/testform.ui
+++ b/examples/jkqtmathtext_test/testform.ui
@ -14,174 +14,18 @@
   <string>Form</string>
  </property>
  <layout class="QGridLayout" name="gridLayout">
-   <item row="4" column="0" rowspan="11">
-    <widget class="QScrollArea" name="scrollArea">
-     <property name="widgetResizable">
-      <bool>true</bool>
-     </property>
-     <widget class="QWidget" name="scrollAreaWidgetContents">
-      <property name="geometry">
-       <rect>
-        <x>0</x>
-        <y>0</y>
-        <width>748</width>
-        <height>538</height>
-       </rect>
-      </property>
-      <layout class="QHBoxLayout" name="horizontalLayout">
-       <item>
-        <widget class="QLabel" name="label">
-         <property name="text">
-          <string>TextLabel</string>
-         </property>
-         <property name="alignment">
-          <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
-         </property>
-        </widget>
-       </item>
-      </layout>
-     </widget>
-    </widget>
-   </item>
-   <item row="11" column="1">
-    <widget class="QLabel" name="label_12">
+   <item row="7" column="1">
+    <widget class="QLabel" name="label_9">
     <property name="font">
      <font>
-       <weight>75</weight>
       <bold>true</bold>
      </font>
     </property>
     <property name="text">
-      <string>render times (getSize()+getAscent()/draw()):</string>
+      <string>HTML output:</string>
     </property>
    </widget>
   </item>
-   <item row="0" column="0" colspan="2">
-    <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,2,0,2,0,0,1,0,0,0,0,0">
-     <item>
-      <widget class="QLabel" name="label_3">
-       <property name="text">
-        <string>testset:</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QComboBox" name="cmbTestset">
-       <property name="currentIndex">
-        <number>-1</number>
-       </property>
-       <property name="maxVisibleItems">
-        <number>30</number>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QLabel" name="label_4">
-       <property name="text">
-        <string>fonts:</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QComboBox" name="cmbFont">
-       <property name="currentIndex">
-        <number>0</number>
-       </property>
-       <item>
-        <property name="text">
-         <string>Below</string>
-        </property>
-       </item>
-       <item>
-        <property name="text">
-         <string>Below+Math: XITS</string>
-        </property>
-       </item>
-       <item>
-        <property name="text">
-         <string>Below+Math: STIX</string>
-        </property>
-       </item>
-       <item>
-        <property name="text">
-         <string>Below+Math: ASANA</string>
-        </property>
-       </item>
-      </widget>
-     </item>
-     <item>
-      <widget class="QLabel" name="label_2">
-       <property name="text">
-        <string>size:</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QLineEdit" name="edtSizes">
-       <property name="text">
-        <string>90,30,20,10</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QCheckBox" name="chkBoxes">
-       <property name="text">
-        <string>boxes</string>
-       </property>
-       <property name="checked">
-        <bool>true</bool>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QCheckBox" name="chkAntiAlias">
-       <property name="text">
-        <string>anti-aliase</string>
-       </property>
-       <property name="checked">
-        <bool>true</bool>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QCheckBox" name="chkAntiAliasHQ">
-       <property name="text">
-        <string>HQ anti-aliase</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QCheckBox" name="chkAntiAliasText">
-       <property name="text">
-        <string>Text anti-aliase</string>
-       </property>
-       <property name="checked">
-        <bool>true</bool>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QCheckBox" name="chkSmoothTransform">
-       <property name="text">
-        <string>smooth transform</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <spacer name="horizontalSpacer">
-       <property name="orientation">
-        <enum>Qt::Horizontal</enum>
-       </property>
-       <property name="sizeHint" stdset="0">
-        <size>
-         <width>40</width>
-         <height>20</height>
-        </size>
-       </property>
-      </spacer>
-     </item>
-    </layout>
-   </item>
   <item row="15" column="0" colspan="2">
    <widget class="JKQTMathTextLabel" name="labMath">
     <property name="text">
@ -195,7 +39,6 @@
      <widget class="QLabel" name="label_8">
       <property name="font">
        <font>
-         <weight>75</weight>
         <bold>true</bold>
        </font>
       </property>
@ -229,18 +72,10 @@
     </item>
    </layout>
   </item>
-   <item row="4" column="1" rowspan="2">
-    <widget class="QPlainTextEdit" name="textBrowserSource">
-     <property name="readOnly">
-      <bool>true</bool>
-     </property>
-    </widget>
-   </item>
   <item row="3" column="0">
    <widget class="QLabel" name="label_11">
     <property name="font">
      <font>
-       <weight>75</weight>
       <bold>true</bold>
      </font>
     </property>
@ -249,16 +84,61 @@
     </property>
    </widget>
   </item>
-   <item row="7" column="1">
-    <widget class="QLabel" name="label_9">
+   <item row="13" column="1">
+    <widget class="QLabel" name="label_10">
     <property name="font">
      <font>
-       <weight>75</weight>
       <bold>true</bold>
      </font>
     </property>
     <property name="text">
-      <string>HTML output:</string>
+      <string>node tree:</string>
+     </property>
+    </widget>
+   </item>
+   <item row="8" column="1">
+    <widget class="QTextBrowser" name="textBrowser"/>
+   </item>
+   <item row="4" column="0" rowspan="11">
+    <widget class="QScrollArea" name="scrollArea">
+     <property name="widgetResizable">
+      <bool>true</bool>
+     </property>
+     <widget class="QWidget" name="scrollAreaWidgetContents">
+      <property name="geometry">
+       <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>752</width>
+        <height>552</height>
+       </rect>
+      </property>
+      <layout class="QHBoxLayout" name="horizontalLayout">
+       <item>
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>TextLabel</string>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+   <item row="12" column="1">
+    <widget class="QLabel" name="labRenderTimes">
+     <property name="text">
+      <string/>
+     </property>
+    </widget>
+   </item>
+   <item row="10" column="1">
+    <widget class="QLabel" name="labParsingTimes">
+     <property name="text">
+      <string/>
     </property>
    </widget>
   </item>
@ -301,18 +181,14 @@
     <item row="0" column="2">
      <widget class="QFontComboBox" name="cmbUnicodeSerif">
       <property name="currentFont">
-        <font>
-         <family>Times New Roman</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
     <item row="2" column="2">
      <widget class="QFontComboBox" name="cmbUnicodeBlackboard">
       <property name="currentFont">
-        <font>
-         <family>Times New Roman</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -326,9 +202,7 @@
     <item row="2" column="8">
      <widget class="QFontComboBox" name="cmbUnicodeSymbol">
       <property name="currentFont">
-        <font>
-         <family>Symbol</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -447,18 +321,14 @@
     <item row="0" column="8">
      <widget class="QFontComboBox" name="cmbUnicodeGreek">
       <property name="currentFont">
-        <font>
-         <family>Symbol</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
     <item row="0" column="5">
      <widget class="QFontComboBox" name="cmbUnicodeSans">
       <property name="currentFont">
-        <font>
-         <family>Arial</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -510,9 +380,7 @@
     <item row="2" column="5">
      <widget class="QFontComboBox" name="cmbUnicodeFraktur">
       <property name="currentFont">
-        <font>
-         <family>Times New Roman</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -553,9 +421,7 @@
     <item row="3" column="5">
      <widget class="QFontComboBox" name="cmbCaligraphic">
       <property name="currentFont">
-        <font>
-         <family>Script</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -596,9 +462,7 @@
     <item row="3" column="8">
      <widget class="QFontComboBox" name="cmbScript">
       <property name="currentFont">
-        <font>
-         <family>Script</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -639,9 +503,7 @@
     <item row="1" column="8">
      <widget class="QFontComboBox" name="cmbUnicodeFixed">
       <property name="currentFont">
-        <font>
-         <family>Courier New</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -682,9 +544,7 @@
     <item row="1" column="2">
      <widget class="QFontComboBox" name="cmbUnicodeSerifMath">
       <property name="currentFont">
-        <font>
-         <family>Times New Roman</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -725,9 +585,7 @@
     <item row="1" column="5">
      <widget class="QFontComboBox" name="cmbUnicodeSansMath">
       <property name="currentFont">
-        <font>
-         <family>Arial</family>
-        </font>
+        <font/>
       </property>
      </widget>
     </item>
@ -760,16 +618,18 @@
     </item>
    </layout>
   </item>
-   <item row="12" column="1">
-    <widget class="QLabel" name="labRenderTimes">
+   <item row="11" column="1">
+    <widget class="QLabel" name="label_12">
+     <property name="font">
+      <font>
+       <bold>true</bold>
+      </font>
+     </property>
     <property name="text">
-      <string/>
+      <string>render times (getSize()+getAscent()/draw()):</string>
     </property>
    </widget>
   </item>
-   <item row="8" column="1">
-    <widget class="QTextBrowser" name="textBrowser"/>
-   </item>
   <item row="14" column="1">
    <widget class="QTreeWidget" name="tree">
     <property name="headerHidden">
@ -782,24 +642,171 @@
     </column>
    </widget>
   </item>
-   <item row="13" column="1">
-    <widget class="QLabel" name="label_10">
-     <property name="font">
-      <font>
-       <weight>75</weight>
-       <bold>true</bold>
-      </font>
-     </property>
-     <property name="text">
-      <string>node tree:</string>
-     </property>
-    </widget>
+   <item row="0" column="0" colspan="2">
+    <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,2,0,2,0,0,1,0,0,0,0,0">
+     <item>
+      <widget class="QLabel" name="label_3">
+       <property name="text">
+        <string>testset:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="cmbTestset">
+       <property name="currentIndex">
+        <number>-1</number>
+       </property>
+       <property name="maxVisibleItems">
+        <number>30</number>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="label_4">
+       <property name="text">
+        <string>fonts:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="cmbFont">
+       <property name="currentIndex">
+        <number>0</number>
+       </property>
+       <item>
+        <property name="text">
+         <string>Below</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Below+Math: XITS</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Below+Math: STIX</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Below+Math: ASANA</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Default-Constructed</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Default-Constructed+SetAppFont</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Default-Constructed+SetAppFont+XITS</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>useAnyUnicode(&quot;Times New Roman&quot;, &quot;Times New Roman&quot;)</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>useAnyUnicode(&quot;Arial&quot;, &quot;Arial&quot;)</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>useAnyUnicode(&quot;Courier New&quot;, &quot;Courier New&quot;)</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>useAnyUnicode(&quot;Comic Sans MS&quot;, &quot;Comic Sans MS&quot;)</string>
+        </property>
+       </item>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="label_2">
+       <property name="text">
+        <string>size:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLineEdit" name="edtSizes">
+       <property name="text">
+        <string>90,30,20,10</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QCheckBox" name="chkBoxes">
+       <property name="text">
+        <string>boxes</string>
+       </property>
+       <property name="checked">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QCheckBox" name="chkAntiAlias">
+       <property name="text">
+        <string>anti-aliase</string>
+       </property>
+       <property name="checked">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QCheckBox" name="chkAntiAliasHQ">
+       <property name="text">
+        <string>HQ anti-aliase</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QCheckBox" name="chkAntiAliasText">
+       <property name="text">
+        <string>Text anti-aliase</string>
+       </property>
+       <property name="checked">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QCheckBox" name="chkSmoothTransform">
+       <property name="text">
+        <string>smooth transform</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
   </item>
   <item row="9" column="1">
    <widget class="QLabel" name="label_13">
     <property name="font">
      <font>
-       <weight>75</weight>
       <bold>true</bold>
      </font>
     </property>
@ -808,17 +815,32 @@
     </property>
    </widget>
   </item>
-   <item row="10" column="1">
-    <widget class="QLabel" name="labParsingTimes">
-     <property name="text">
-      <string/>
+   <item row="4" column="1" rowspan="2">
+    <widget class="QPlainTextEdit" name="textBrowserSource">
+     <property name="readOnly">
+      <bool>true</bool>
     </property>
    </widget>
   </item>
   <item row="6" column="1">
-    <widget class="QLabel" name="labError">
-     <property name="text">
-      <string/>
+    <widget class="QTextBrowser" name="labError">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="MinimumExpanding">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="maximumSize">
+      <size>
+       <width>16777215</width>
+       <height>48</height>
+      </size>
+     </property>
+     <property name="frameShape">
+      <enum>QFrame::NoFrame</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Plain</enum>
     </property>
    </widget>
   </item>
--- a/lib/jkqtmathtext/jkqtmathtext.cpp
+++ b/lib/jkqtmathtext/jkqtmathtext.cpp
@ -62,9 +62,12 @@ JKQTMathText::JKQTMathText(QObject* parent):
    fontSize=10;
    brace_factor=1.04;
    subsuper_size_factor=0.7;
+    subsuper_mode_selection_by_size_factor=1.01;
    italic_correction_factor=0.4;
    sub_shift_factor=0.4;
-    super_shift_factor=0.6;
+    super_shift_factor=0.7;
+    special_sub_shift_factor=0.4;
+    special_super_shift_factor=0.4;
    brace_shrink_factor=0.6;
    fontColor=QColor("black");

@ -77,7 +80,10 @@ JKQTMathText::JKQTMathText(QObject* parent):
    decoration_width_reduction_Xfactor=0.2;
    brace_y_shift_factor=0.7;//-1;
    operatorsubsuper_size_factor=0.65;
+    operatorsubsuper_distance_factor=0.25;
+    operatorsubsuper_extraspace_factor=0.5;
    mathoperator_width_factor=1.5;
+    bigmathoperator_font_factor=1.8;

    blackboardSimulated=true;

@ -200,9 +206,12 @@ void JKQTMathText::loadSettings(const QSettings& settings, const QString& group)
    brace_factor=settings.value(group+"brace_factor", brace_factor).toDouble();
    brace_shrink_factor=settings.value(group+"brace_shrink_factor", brace_shrink_factor).toDouble();
    subsuper_size_factor=settings.value(group+"subsuper_size_factor", subsuper_size_factor).toDouble();
+    subsuper_mode_selection_by_size_factor=settings.value(group+"subsuper_mode_selection_by_size_factor", subsuper_mode_selection_by_size_factor).toDouble();
    italic_correction_factor=settings.value(group+"italic_correction_factor", italic_correction_factor).toDouble();
    super_shift_factor=settings.value(group+"super_shift_factor", super_shift_factor).toDouble();
    sub_shift_factor=settings.value(group+"sub_shift_factor", sub_shift_factor).toDouble();
+    special_super_shift_factor=settings.value(group+"special_super_shift_factor", special_super_shift_factor).toDouble();
+    special_sub_shift_factor=settings.value(group+"special_sub_shift_factor", special_sub_shift_factor).toDouble();
    frac_factor=settings.value(group+"frac_factor", frac_factor).toDouble();
    frac_shift_factor=settings.value(group+"frac_shift_factor", frac_shift_factor).toDouble();
    underbrace_factor=settings.value(group+"underbrace_factor", underbrace_factor).toDouble();
@ -211,6 +220,8 @@ void JKQTMathText::loadSettings(const QSettings& settings, const QString& group)
    decoration_height_factor=settings.value(group+"decoration_height_factor", decoration_height_factor).toDouble();
    decoration_width_reduction_Xfactor=settings.value(group+"decoration_width_reduction_xfactor", decoration_width_reduction_Xfactor).toDouble();
    operatorsubsuper_size_factor=settings.value(group+"operatorsubsuper_size_factor", operatorsubsuper_size_factor).toDouble();
+    operatorsubsuper_distance_factor=settings.value(group+"operatorsubsuper_distance_factor", operatorsubsuper_distance_factor).toDouble();
+    operatorsubsuper_extraspace_factor=settings.value(group+"operatorsubsuper_extraspace_factor", operatorsubsuper_extraspace_factor).toDouble();
    mathoperator_width_factor=settings.value(group+"mathoperator_width_factor", mathoperator_width_factor).toDouble();


@ -226,14 +237,19 @@ void JKQTMathText::saveSettings(QSettings& settings, const QString& group) const
    settings.setValue(group+ "brace_factor", brace_factor);
    settings.setValue(group+ "brace_shrink_factor", brace_shrink_factor);
    settings.setValue(group+ "subsuper_size_factor", subsuper_size_factor);
+    settings.setValue(group+ "subsuper_mode_selection_by_size_factor", subsuper_mode_selection_by_size_factor);
    settings.setValue(group+ "italic_correction_factor", italic_correction_factor);
    settings.setValue(group+ "sub_shift_factor", sub_shift_factor);
    settings.setValue(group+ "super_shift_factor", super_shift_factor);
+    settings.setValue(group+ "special_sub_shift_factor", special_sub_shift_factor);
+    settings.setValue(group+ "special_super_shift_factor", special_super_shift_factor);
    settings.setValue(group+ "frac_factor", frac_factor);
    settings.setValue(group+ "frac_shift_factor", frac_shift_factor);
    settings.setValue(group+ "underbrace_factor", underbrace_factor);
    settings.setValue(group+ "undersetFactor", underset_factor);
    settings.setValue(group+ "operatorsubsuper_size_factor", operatorsubsuper_size_factor);
+    settings.setValue(group+ "operatorsubsuper_distance_factor", operatorsubsuper_distance_factor);
+    settings.setValue(group+ "operatorsubsuper_extraspace_factor", operatorsubsuper_extraspace_factor);
    settings.setValue(group+ "mathoperator_width_factor", mathoperator_width_factor);
    settings.setValue(group+ "brace_y_shift_factor", brace_y_shift_factor);
    settings.setValue(group+ "decoration_height_factor", decoration_height_factor);
@ -358,10 +374,8 @@ void JKQTMathText::addReplacementFont(const QString &nonUseFont, const QString &

 QPair<QString,JKQTMathTextFontEncoding> JKQTMathText::getReplacementFont(const QString &nonUseFont, const QString &defaultFont, JKQTMathTextFontEncoding defaultFontEncoding) const {
    QPair<QString,JKQTMathTextFontEncoding> res(defaultFont, defaultFontEncoding);
-    bool foundFont=false;
    for (auto it=fontReplacements.begin(); it!=fontReplacements.end(); ++it) {
        if (it.key().toLower()==nonUseFont.toLower()) {
-            foundFont=true;
            res.first=it.value();
            res.second=fontEncodingReplacements.value(res.first, res.second);
            return res;
@ -639,6 +653,16 @@ double JKQTMathText::getSubsuperSizeFactor() const
    return this->subsuper_size_factor;
 }

+void JKQTMathText::setSubsuperModeSelectionBySizeFactor(double __value)
+{
+    subsuper_mode_selection_by_size_factor=__value;
+}
+
+double JKQTMathText::getSubsuperModeSelectionBySizeFactor() const
+{
+    return subsuper_mode_selection_by_size_factor;
+}
+
 void JKQTMathText::setItalicCorrectionFactor(double __value)
 {
    this->italic_correction_factor = __value;
@ -659,6 +683,26 @@ double JKQTMathText::getOperatorsubsuperSizeFactor() const
    return this->operatorsubsuper_size_factor;
 }

+void JKQTMathText::setOperatorsubsuperDistanceFactor(double __value)
+{
+    this->operatorsubsuper_distance_factor = __value;
+}
+
+double JKQTMathText::getOperatorsubsuperDistanceFactor() const
+{
+    return this->operatorsubsuper_distance_factor;
+}
+
+void JKQTMathText::setOperatorsubsuperExtraSpaceFactor(double __value)
+{
+    operatorsubsuper_extraspace_factor=__value;
+}
+
+double JKQTMathText::getOperatorsubsuperExtraSpaceFactor() const
+{
+    return operatorsubsuper_extraspace_factor;
+}
+
 void JKQTMathText::setMathoperatorWidthFactor(double __value)
 {
    this->mathoperator_width_factor = __value;
@ -669,6 +713,16 @@ double JKQTMathText::getMathoperatorWidthFactor() const
    return this->mathoperator_width_factor;
 }

+void JKQTMathText::setBigMathoperatorFontFactor(double __value)
+{
+    bigmathoperator_font_factor=__value;
+}
+
+double JKQTMathText::getBigMathoperatorFontFactor() const
+{
+    return bigmathoperator_font_factor;
+}
+
 void JKQTMathText::setSuperShiftFactor(double __value)
 {
    this->super_shift_factor = __value;
@ -689,6 +743,26 @@ double JKQTMathText::getSubShiftFactor() const
    return this->sub_shift_factor;
 }

+double JKQTMathText::getSpecialSuperShiftFactor() const
+{
+    return special_super_shift_factor;
+}
+
+void JKQTMathText::setSpecialSuperShiftFactor(double __value)
+{
+    special_super_shift_factor=__value;
+}
+
+void JKQTMathText::setSpecialSubShiftFactor(double __value)
+{
+    special_sub_shift_factor=__value;
+}
+
+double JKQTMathText::getSpecialSubShiftFactor() const
+{
+    return special_sub_shift_factor;
+}
+
 void JKQTMathText::setBraceShrinkFactor(double __value)
 {
    this->brace_shrink_factor = __value;
@ -1174,6 +1248,17 @@ JKQTMathTextNode* JKQTMathText::parseLatexString(bool get, JKQTMathTextBraceType
                        nl->addChild(new JKQTMathTextInstruction1Node(this, currentInstructionName, parseLatexString(true)));
                    }
                }
+                if (getNew) getToken();
+                if (currentToken==MTTinstruction && currentTokenName=="limits") {
+                    if (nl->hasChildren()) nl->getLastChild()->setSubSuperscriptAboveBelowNode(true);
+                    getNew=true;
+                } else  if (currentToken==MTTinstruction && currentTokenName=="nolimits") {
+                    if (nl->hasChildren()) nl->getLastChild()->setSubSuperscriptAboveBelowNode(false);
+                    getNew=true;
+                } else {
+                    getNew=false;
+                }
+
            } else if (currentToken==MTTopenbracket && currentInstructionName!="left") {
                //std::cout<<"found '[' after '"<<name.toStdString()<<"'\n";
                if (currentInstructionName=="sqrt") {
@ -1201,6 +1286,7 @@ JKQTMathTextNode* JKQTMathText::parseLatexString(bool get, JKQTMathTextBraceType
                    nl->addChild(new JKQTMathTextTextNode(this, "[", false));
                }
            } else {
+                bool subSuperscriptAboveBelowNode=false;
                //std::cout<<"did not find '{' after '"<<name.toStdString()<<"'\n";
                if (currentInstructionName=="right") {
                    if (currentToken==MTTtext) {
@ -1257,32 +1343,23 @@ JKQTMathTextNode* JKQTMathText::parseLatexString(bool get, JKQTMathTextBraceType
                    }

                } else {
-                    //bool addWhite=(currentToken==MTTwhitespace);
-                    //getNew=addWhite;
-                    getNew=false;
-                    bool done=false;
-                    if (currentInstructionName.size()==2) {
-                        QChar n0=currentInstructionName[0];
-                        QChar n1=currentInstructionName[1];
-                        if (n0=='v' && n1.isLetter()) {
-                            done=true;
-                            //std::cout<<"found \\v... command\n";
-                            nl->addChild(new JKQTMathTextDecoratedNode(this, JKQTMathTextDecoratedNode::MTDvec, new JKQTMathTextTextNode(this, QString(n1), false, parsingMathEnvironment)));
-                        } else if (n0=='c' && n1.isLetter()) {
-                            done=true;
-                            //std::cout<<"found \\v... command\n";
-                            nl->addChild(new JKQTMathTextInstruction1Node(this, "mathcal", new JKQTMathTextTextNode(this, QString(n1), false, parsingMathEnvironment)));
-                        }
-                    } else if (currentInstructionName.size()==3) {
-                        QString n0=currentInstructionName.left(2);
-                        QChar n1=currentInstructionName[currentInstructionName.size()-1];
-                        if (n0=="bb" && n1.isLetter()) {
-                            done=true;
-                            //std::cout<<"found \\v... command\n";
-                            nl->addChild(new JKQTMathTextInstruction1Node(this, "mathbb", new JKQTMathTextTextNode(this, QString(n1), false, parsingMathEnvironment)));
-                        }
+                    nl->addChild(new JKQTMathTextSymbolNode(this, currentInstructionName, false));
+
+                    static QSet<QString> subsupOperations= (QSet<QString>()<<"sum"<<"prod"<<"coprod"
+                                                                           <<"bigcap"<<"bigcup"<<"bigvee"<<"bighat"
+                                                                           <<"int"<<"iint"<<"iiint"<<"oint"<<"oiint"<<"oiiint"
+                                                                           <<"mod"<<"median"<<"max"<<"min"<<"argmax"<<"argmin"<<"sup"<<"inf"
+                                                                           <<"liminf"<<"limsup"<<"lim"<<"max"<<"min");
+                    if (subsupOperations.contains(currentInstructionName) && parsingMathEnvironment) {
+                        nl->getLastChild()->setSubSuperscriptAboveBelowNode(true);
+                    }
+                    if (currentToken==MTTinstruction && currentTokenName=="limits") {
+                        if (nl->hasChildren()) nl->getLastChild()->setSubSuperscriptAboveBelowNode(true);
+                    } else  if (currentToken==MTTinstruction && currentTokenName=="nolimits") {
+                        if (nl->hasChildren()) nl->getLastChild()->setSubSuperscriptAboveBelowNode(false);
+                    } else {
+                        getNew=false;
                    }
-                    if (!done) nl->addChild(new JKQTMathTextSymbolNode(this, currentInstructionName, false));//, addWhite));

                }
            }
@ -1387,7 +1464,6 @@ bool JKQTMathText::parse(const QString& text, bool addSpaceBeforeAndAfter){
    QString ntext;
    if (addSpaceBeforeAndAfter) ntext=QString("\\;")+text+QString("\\;");
    else ntext=text;
-    ntext=ntext.remove("\\limits");
    if (parsedNode && parseString==ntext) return true;


--- a/lib/jkqtmathtext/jkqtmathtext.h
+++ b/lib/jkqtmathtext/jkqtmathtext.h
@ -416,10 +416,10 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
         * use generic Unicode fonts, e.g. "Arial" and "Times New Roman" in math-mode.
         * You should use fonts that contain as many of the mathematical symbols as possible to ensure good rendering results.
         *
-         * <code>setAnyUnicode("Times New Roman", "Times New Roman")</code>:<br>\image html jkqtmathtext/jkqtmathparser_timesnewroman.png  <br><br>
-         * <code>setAnyUnicode("Arial", "Arial")</code>:<br>\image html jkqtmathtext/jkqtmathparser_arial.png  <br><br>
-         * <code>setAnyUnicode("Courier New", "Courier New")</code>:<br>\image html jkqtmathtext/jkqtmathparser_couriernew.png  <br><br>
-         * <code>setAnyUnicode("Comic Sans MS", "Comic Sans MS")</code>:<br>\image html jkqtmathtext/jkqtmathparser_comicsans.png  <br><br>
+         * <code>useAnyUnicode("Times New Roman", "Times New Roman")</code>:<br>\image html jkqtmathtext/jkqtmathparser_timesnewroman.png  <br><br>
+         * <code>useAnyUnicode("Arial", "Arial")</code>:<br>\image html jkqtmathtext/jkqtmathparser_arial.png  <br><br>
+         * <code>useAnyUnicode("Courier New", "Courier New")</code>:<br>\image html jkqtmathtext/jkqtmathparser_couriernew.png  <br><br>
+         * <code>useAnyUnicode("Comic Sans MS", "Comic Sans MS")</code>:<br>\image html jkqtmathtext/jkqtmathparser_comicsans.png  <br><br>
         *
         */
        void useAnyUnicode(QString timesFont=QString(""), const QString& sansFont=QString(""), JKQTMathTextFontEncoding encodingTimes=JKQTMathTextFontEncoding::MTFEunicode, JKQTMathTextFontEncoding encodingSans=JKQTMathTextFontEncoding::MTFEunicode);
@ -434,6 +434,10 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
        void setSubsuperSizeFactor(double __value);
        /** \copydoc subsuper_size_factor */
        double getSubsuperSizeFactor() const;
+        /** \copydoc subsuper_mode_selection_by_size_factor */
+        void setSubsuperModeSelectionBySizeFactor(double __value);
+        /** \copydoc subsuper_mode_selection_by_size_factor */
+        double getSubsuperModeSelectionBySizeFactor() const;
        /** \copydoc italic_correction_factor */
        void setItalicCorrectionFactor(double __value);
        /** \copydoc italic_correction_factor */ 
@ -442,10 +446,22 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
        void setOperatorsubsuperSizeFactor(double __value);
        /** \copydoc operatorsubsuper_size_factor */ 
        double getOperatorsubsuperSizeFactor() const;
+        /** \copydoc operatorsubsuper_distance_factor */
+        void setOperatorsubsuperDistanceFactor(double __value);
+        /** \copydoc operatorsubsuper_distance_factor */
+        double getOperatorsubsuperDistanceFactor() const;
+        /** \copydoc operatorsubsuper_extraspace_factor */
+        void setOperatorsubsuperExtraSpaceFactor(double __value);
+        /** \copydoc operatorsubsuper_extraspace_factor */
+        double getOperatorsubsuperExtraSpaceFactor() const;
        /** \copydoc mathoperator_width_factor */
        void setMathoperatorWidthFactor(double __value);
        /** \copydoc mathoperator_width_factor */
        double getMathoperatorWidthFactor() const;
+        /** \copydoc bigmathoperator_font_factor */
+        void setBigMathoperatorFontFactor(double __value);
+        /** \copydoc bigmathoperator_font_factor */
+        double getBigMathoperatorFontFactor() const;
        /** \copydoc super_shift_factor */
        void setSuperShiftFactor(double __value);
        /** \copydoc super_shift_factor */
@ -454,6 +470,14 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
        void setSubShiftFactor(double __value);
        /** \copydoc sub_shift_factor */
        double getSubShiftFactor() const;
+        /** \copydoc special_super_shift_factor */
+        void setSpecialSuperShiftFactor(double __value);
+        /** \copydoc special_super_shift_factor */
+        double getSpecialSuperShiftFactor() const;
+        /** \copydoc special_sub_shift_factor */
+        void setSpecialSubShiftFactor(double __value);
+        /** \copydoc special_sub_shift_factor */
+        double getSpecialSubShiftFactor() const;
        /** \copydoc brace_shrink_factor */
        void setBraceShrinkFactor(double __value);
        /** \copydoc brace_shrink_factor */ 
@ -529,10 +553,37 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
        double brace_shrink_factor;
        /** \brief resizing factor for font size in sub-/superscript */
        double subsuper_size_factor;
+        /** \brief this factor is used to determine how to typeset sub-/superscript.
+         *
+         *  If the ascent for superscript of descent for subscript of the previous character is  \c >=subsuper_mode_selection_by_size_factor*ascent(currentFont)
+         *  or \c <=subsuper_mode_selection_by_size_factor*descent(currentFont) respectively, the sub/superscript is typeset, aligned with the ascent or descent
+         *  of the previous character. Otherwise it is aligned with the default method:
+         *
+         *  <b>Default mode:</b>
+         *  \image html jkqtmathtext_superscriptnode_getSizeInternal.png
+         *  \image html jkqtmathtext_subscriptnode_getSizeInternal.png
+         *
+         *  <b>Special mode:</b>
+         *
+         *
+         *  This method fixes problems with characters that are significantyl larger that normal text character of the fonst, such as generated
+         *  by \c \\sum,\\int,... .
+         */
+        double subsuper_mode_selection_by_size_factor;
        /** \brief fraction of a whitespace by which to shift a sub-/superscript left/right when the previous text is italic */
        double italic_correction_factor;
-        /** \brief like subsuper_size_factor, but for operators (\C \\sum , \c \\int , ...) where the text is placed above/below the symbol */
+        /** \brief like subsuper_size_factor, but for operators (\c \\sum , \c \\int , ...) where the text is placed above/below the symbol */
        double operatorsubsuper_size_factor;
+        /** \brief for operators (\c \\sum , \c \\int , ...) where the text is placed above/below the symbol, this is the distance between the operator symbol and the sub-/super-text if multiplied by xHeight
+         *
+         *  \image html jkqtmathtext_subsuper_with_limits.png
+         */
+        double operatorsubsuper_distance_factor;
+        /** \brief for operators (\c \\sum , \c \\int , ...) where the text is placed above/below the symbol, this is the additional width added to the width of maximum width of the operator, above and below
+         *
+         *  \image html jkqtmathtext_subsuper_with_limits.png
+         */
+        double operatorsubsuper_extraspace_factor;
        /** \brief factor, used to extend the size of an operator in math mode
         *
         *  The next image demonstrates the effect of this property, which adds extra space
@ -541,6 +592,10 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
         *  \image html jkqtmathparser_mathoperator_width_factor.png
         */
        double mathoperator_width_factor;
+        /** \brief factor, used to increase the font size for big math operators, such as \c \\sum , \c \\prod , ...
+         *
+         */
+        double bigmathoperator_font_factor;
        /** \brief relative shift of text in superscript to normal text:
         *         0= baseline kept, 1: baseline shifted to top of normal text
         *
@ -553,6 +608,18 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
         *  \image html jkqtmathtext_subscriptnode_getSizeInternal.png
         */
        double sub_shift_factor;
+        /** \brief relative shift of text in superscript to normal text in special superscript mode (after large previous nodes):
+         *         0= superscript descent coincides with the previous node's baselineHeight, 1: top of previous node and top of the superscript nodes coincide
+         *
+         *  \image html jkqtmathtext_specialsuperscriptnode_getSizeInternal.png
+         */
+        double special_super_shift_factor;
+        /** \brief relative shift of text in subscript to normal text in special superscript mode (after large previous nodes):
+         *         0=child's baseline at the descent of the previous node, 1: subscript-node starts at the descent of the previous node
+         *
+         *  \image html jkqtmathtext_specialsubscriptnode_getSizeInternal.png
+         */
+        double special_sub_shift_factor;


        /** \brief scaling factor for font size of nominator and denominator of a fraction
--- a/lib/jkqtmathtext/nodes/jkqtmathtextlistnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextlistnode.cpp
@ -36,12 +36,6 @@
 #include <QFont>


-QSet<QString> JKQTMathTextListNode::subsupOperations= (QSet<QString>()<<"sum"<<"prod"<<"coprod"
-                                                                        <<"bigcap"<<"bigcup"<<"bigvee"<<"bighat"
-                                                                        <<"int"<<"iint"<<"iiint"<<"oint"<<"oiint"<<"oiiint"
-                                                                        <<"mod"<<"median"<<"max"<<"min"<<"argmax"<<"argmin"<<"sup"<<"inf"
-                                                                        <<"liminf"<<"limsup"<<"lim"<<"max"<<"min");
-
 JKQTMathTextListNode::JKQTMathTextListNode(JKQTMathText* _parent):
    JKQTMathTextMultiChildNode(_parent)
 {
@ -50,7 +44,7 @@ JKQTMathTextListNode::JKQTMathTextListNode(JKQTMathText* _parent):
 }

 JKQTMathTextListNode::~JKQTMathTextListNode() {
-    clearChildren(true);
+    clearChildrenImpl(true);
 }

 QString JKQTMathTextListNode::getTypeName() const
@ -63,7 +57,12 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro
    overallHeight=0;
    baselineHeight=0;
    strikeoutPos=0;
-    QFontMetricsF fm(currentEv.getFont(parentMathText));
+    const QFontMetricsF fm(currentEv.getFont(parentMathText));
+    const double subsupershift=fm.xHeight()*parentMathText->getOperatorsubsuperDistanceFactor();
+    const double subsuperextrawidth=fm.boundingRect('x').width()*parentMathText->getOperatorsubsuperExtraSpaceFactor();
+    const double subsuperSpecialModeAscent=fm.ascent()*parentMathText->getSubsuperModeSelectionBySizeFactor();
+    const double subsuperSpecialModeDecent=fm.descent()*parentMathText->getSubsuperModeSelectionBySizeFactor();
+    const double spaceWidth=fm.boundingRect(' ').width();
    //QRectF tbr=parent->getTightBoundingRect(currentEv.getFont(parent), "M", painter.device());


@ -71,23 +70,30 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro
    bool wasBrace=false;
    for (int i=0; i<nodes.size(); i++) {
        JKQTMathTextNodeSize prevNodeSize;
-        JKQTMathTextNodeSize* prevNodeSizePtr=nullptr;
+        JKQTMathTextNodeSize* prevNodeSizePtrForSubscript=nullptr;
+        JKQTMathTextNodeSize* prevNodeSizePtrForSuperscript=nullptr;

-        if (i>0 && wasBrace) {
+        if (i>0) {
            nodes[i-1]->getSize(painter, currentEv, prevNodeSize.width, prevNodeSize.baselineHeight, prevNodeSize.overallHeight, prevNodeSize.strikeoutPos);
-            prevNodeSizePtr=&prevNodeSize;
+            const double prevAscent=prevNodeSize.baselineHeight;
+            const double prevDescent=prevNodeSize.overallHeight-prevNodeSize.baselineHeight;
+            const bool shouldUseSpecialSubscriptMode=prevAscent>=subsuperSpecialModeAscent;
+            const bool shouldUseSpecialSuperscriptMode=prevDescent>=subsuperSpecialModeDecent;
+            if (shouldUseSpecialSubscriptMode)  prevNodeSizePtrForSubscript=&prevNodeSize;
+            if (shouldUseSpecialSuperscriptMode)  prevNodeSizePtrForSuperscript=&prevNodeSize;
        }

+        JKQTMathTextSuperscriptNode* nodeI_SuperScript=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i]);
+        JKQTMathTextSubscriptNode* nodeI_SubScript=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i]);

        bool doDraw=true;
-        JKQTMathTextSymbolNode* smb=dynamic_cast<JKQTMathTextSymbolNode*>(nodes[i]);
        // if we find a subscript/superscript node we check whether the next node is super/subscript
        // if so, we typeset them at the same x-psotion, so sub/superscripts appear correctly
-        if (dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i])) {
+        if (nodeI_SuperScript) {
            if (i+1<nodes.size()) { // is there one mor node behind?
                if (dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+1])) { // is this subscript?
                    double w1, w2, oh, bh, sp;
-                    nodes[i]->getSize(painter, currentEv, w1, bh, oh, sp, prevNodeSizePtr);
+                    nodes[i]->getSize(painter, currentEv, w1, bh, oh, sp, prevNodeSizePtrForSuperscript);

                    if (bh>baselineHeight) {
                        overallHeight=overallHeight+bh-baselineHeight;
@ -100,7 +106,7 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro
                    }

                    i++;
-                    nodes[i]->getSize(painter, currentEv, w2, bh, oh, sp, prevNodeSizePtr);
+                    nodes[i]->getSize(painter, currentEv, w2, bh, oh, sp, prevNodeSizePtrForSubscript);
                    //qDebug()<<"super_sub:   sub: "<<nodes[i]->getTypeName()<<"  w2="<<w2<<" bh"<<bh<<" oh="<<oh<<" sp="<<sp;
                    if (bh>baselineHeight) {
                        overallHeight=overallHeight+bh-baselineHeight;
@ -111,18 +117,18 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro
                        overallHeight=baselineHeight+oh-bh;
                        strikeoutPos=sp;
                    }
-                    xnew+=qMax(w1+fm.boundingRect(' ').width(), w2);
+                    xnew+=qMax(w1+spaceWidth, w2);

                    doDraw=false;
                    //qDebug()<<"### super+sub";
                    //qDebug()<<"### subsupop: super+sub   overallHeight="<<overallHeight<<" baselineHeight="<<baselineHeight;
                }
            }
-        } else if (dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i])) {
+        } else if (nodeI_SubScript) {
            if (i+1<nodes.size()) { // is there one mor node behind?
                if (dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+1])) { // is this subscript?
                    double w1, w2, oh, bh, sp;
-                    nodes[i]->getSize(painter, currentEv, w1, bh, oh, sp, prevNodeSizePtr);
+                    nodes[i]->getSize(painter, currentEv, w1, bh, oh, sp, prevNodeSizePtrForSubscript);
                    if (bh>baselineHeight) {
                        overallHeight=overallHeight+bh-baselineHeight;
                        baselineHeight=bh;
@ -134,7 +140,7 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro
                    }

                    i++;
-                    nodes[i]->getSize(painter, currentEv, w2, bh, oh, sp, prevNodeSizePtr);
+                    nodes[i]->getSize(painter, currentEv, w2, bh, oh, sp, prevNodeSizePtrForSuperscript);
                    if (bh>baselineHeight) {
                        overallHeight=overallHeight+bh-baselineHeight;
                        baselineHeight=bh;
@ -144,7 +150,7 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro
                        overallHeight=baselineHeight+oh-bh;
                        strikeoutPos=sp;
                    }
-                    xnew+=qMax(w1, w2+fm.boundingRect(' ').width());
+                    xnew+=qMax(w1, w2+spaceWidth);


                    doDraw=false;
@ -152,95 +158,103 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro
                    //qDebug()<<"### subsupop: sub+super1   overallHeight="<<overallHeight<<" baselineHeight="<<baselineHeight;
                }
            }
-        } else if (smb) {
-            QString s=smb->getSymbolName();
-            if (subsupOperations.contains(s)) {
+        } else {
+            if (nodes[i]->isSubSuperscriptAboveBelowNode()) {
                JKQTMathTextSubscriptNode* subn=nullptr;
-                if (i+1<nodes.size()) subn=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+1]);
                JKQTMathTextSuperscriptNode* supn=nullptr;
-                if (i+2<nodes.size()) supn=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+2]);
+                JKQTMathTextSubscriptNode* subn2=nullptr;
+                JKQTMathTextSuperscriptNode* supn2=nullptr;
+                if (i+1<nodes.size()) {
+                    subn=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+1]);
+                    supn=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+1]);
+                }
+                if (i+2<nodes.size()) {
+                    subn2=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+2]);
+                    supn2=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+2]);
+                }
                //std::cout<<"symbol ='"<<s.toStdString()<<"'   subn="<<subn<<"   supn="<<supn<<"\n";
-                if (subn && supn) { // is this subscript and superscript?
-                    JKQTMathTextEnvironment ev=currentEv;
+                if ((subn && supn2) || (subn2 && supn)) { // is this subscript and superscript  or superscript and subscript?
+                    if (!subn) subn=subn2;
+                    if (!supn) supn=supn2;                    JKQTMathTextEnvironment ev=currentEv;
                    ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
-                    double w1=0, w2=0, w3=0;
-                    double oh1=0, oh2=0, oh3=0;
-                    double bh1=0, bh2=0, bh3=0;
-                    double sp1=0, sp2=0, sp3=0;
+                    double w1=0, wsub=0, wsup=0;
+                    double oh1=0, ohsub=0, ohsup=0;
+                    double bh1=0, bhsub=0, bhsup=0;
+                    double sp1=0, spsub=0, spsup=0;
                    nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp1);
                    //qDebug()<<"sub_super:   node: "<<nodes[i]->getTypeName()<<"  w1="<<w1<<" bh"<<bh1<<" oh="<<oh1<<" sp="<<sp1;
-                    subn->getChild()->getSize(painter, ev, w2, bh2, oh2, sp2);
+                    subn->getChild()->getSize(painter, ev, wsub, bhsub, ohsub, spsub);
                    //qDebug()<<"sub_super:   node: "<<subn->getTypeName()<<"  w2="<<w2<<" bh2"<<bh2<<" oh2="<<oh2<<" sp2="<<sp2;
-                    supn->getChild()->getSize(painter, ev, w3, bh3, oh3, sp3);
+                    supn->getChild()->getSize(painter, ev, wsup, bhsup, ohsup, spsup);
                    //qDebug()<<"sub_super:   node: "<<supn->getTypeName()<<"  w3="<<w3<<" bh3"<<bh3<<" oh3="<<oh3<<" sp3="<<sp3;
                    //double d1=oh1-bh1;
                    //double d2=oh2-bh2;
                    //double d3=oh3-bh3;
-                    double w=qMax(qMax(w1, w2), w3)+fm.boundingRect(' ').width();
+                    const double neww=qMax(qMax(w1, wsub), wsup)+subsuperextrawidth;

-                    double oh=oh1+oh2+oh3;
-                    double bh=bh1+oh3;
-                    if (oh>overallHeight) overallHeight=oh;
-                    if (bh>baselineHeight) { baselineHeight=bh; strikeoutPos=sp1; }
-                    if (oh-bh>overallHeight-baselineHeight) {
-                        overallHeight=baselineHeight+oh-bh;
+                    const double newBaselineHeight=bh1+ohsup+subsupershift;
+                    if (newBaselineHeight>baselineHeight) {
+                        const double extraBaselineHeight=newBaselineHeight-baselineHeight;
+                        baselineHeight=newBaselineHeight;
+                        overallHeight=overallHeight+extraBaselineHeight;
+                    }
+                    const double newDescent=oh1-bh1+ohsub+subsupershift;
+                    if (newDescent>overallHeight-baselineHeight) {
+                        const double extraDescent=newDescent-(overallHeight-baselineHeight);
+                        overallHeight=overallHeight+extraDescent;
                    }

                    i++;
                    i++;
                    doDraw=false;
-                    xnew+=w;
+                    xnew+=neww;
                    //qDebug()<<"### subsupop: sub+super2   overallHeight="<<overallHeight<<" baselineHeight="<<baselineHeight;
-                /*} else if (subn && supn) { // is this subscript and superscript?
-                    MTenvironment ev=currentEv;
-                    ev.fontSize=ev.fontSize*parent->getOperatorsubsuperSizeFactor();
-                    double w1=0, w2=0, w3=0;
-                    double oh1=0, oh2=0, oh3=0;
-                    double bh1=0, bh2=0, bh3=0;
-                    double sp1=0, sp2=0, sp3=0;
-                    nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp1);
-                    supn->getChild()->getSize(painter, ev, w3, bh3, oh3, sp3);
-                    //double d1=oh1-bh1;
-                    //double d2=oh2-bh2;
-                    //double d3=oh3-bh3;
-                    double w=qMax(w1, w3)+fm.boundingRect(' ').width();

-                    double oh=oh1+oh3;
-                    double bh=bh1+oh3;
-                    if (oh>overallHeight) overallHeight=oh;
-                    if (bh>baselineHeight) { baselineHeight=bh; strikeoutPos=sp1; }
-                    if (oh-bh>overallHeight-baselineHeight) {
-                        overallHeight=baselineHeight+oh-bh;
-                    }
-
-                    i++;
-                    i++;
-                    doDraw=false;
-                    xnew+=w;
-                    //qDebug()<<"### subsupop: sub+super";*/
                } else if (subn) { // is this subscript?
                    JKQTMathTextEnvironment ev=currentEv;
                    ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
-                    double w1=0, w2=0;
-                    double oh1=0, oh2=0;
-                    double bh1=0, bh2=0;
-                    double sp1=0, sp2=0;//, sp3=0;
+                    double w1=0, wsub=0;
+                    double oh1=0, ohsub=0;
+                    double bh1=0, bhsub=0;
+                    double sp1=0, spsub=0;//, sp3=0;
                    nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp1);
-                    subn->getChild()->getSize(painter, ev, w2, bh2, oh2, sp2);
+                    subn->getChild()->getSize(painter, ev, wsub, bhsub, ohsub, spsub);
                    //double d1=oh1-bh1;
                    //double d2=oh2-bh2;

-                    double oh=oh1+oh2;
-                    double sh=oh1-bh1+oh2*1.1;
-                    if (oh>overallHeight) overallHeight=oh;
-                    if (bh1>baselineHeight) baselineHeight=bh1;
-                    if (sh>overallHeight-baselineHeight) {
-                        overallHeight=baselineHeight+sh;
+                    const double newDescent=oh1-bh1+ohsub+subsupershift;
+                    if (newDescent>overallHeight-baselineHeight) {
+                        const double extraDescent=newDescent-(overallHeight-baselineHeight);
+                        overallHeight=overallHeight+extraDescent;
                    }
-                    double w=qMax(w1, w2)+fm.boundingRect(' ').width();
+                    const double neww=qMax(w1, wsub)+subsuperextrawidth;
                    i++;
                    doDraw=false;
-                    xnew+=w;
+                    xnew+=neww;
+                    //qDebug()<<"### subsupop: sub   overallHeight="<<overallHeight<<" baselineHeight="<<baselineHeight;
+                } else if (supn) { // is this superscript?
+                    JKQTMathTextEnvironment ev=currentEv;
+                    ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
+                    double w1=0, wsup=0;
+                    double oh1=0, ohsup=0;
+                    double bh1=0, bhsup=0;
+                    double sp1=0, spsup=0;//, sp3=0;
+                    nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp1);
+                    supn->getChild()->getSize(painter, ev, wsup, bhsup, ohsup, spsup);
+                    //double d1=oh1-bh1;
+                    //double d2=oh2-bh2;
+
+                    const double newBaselineHeight=bh1+ohsup+subsupershift;
+                    if (newBaselineHeight>baselineHeight) {
+                        const double extraBaselineHeight=newBaselineHeight-baselineHeight;
+                        baselineHeight=newBaselineHeight;
+                        overallHeight=overallHeight+extraBaselineHeight;
+                    }
+
+                    const double neww=qMax(w1, wsup)+subsuperextrawidth;
+                    i++;
+                    doDraw=false;
+                    xnew+=neww;
                    //qDebug()<<"### subsupop: sub   overallHeight="<<overallHeight<<" baselineHeight="<<baselineHeight;
                }
            }
@ -248,17 +262,19 @@ void JKQTMathTextListNode::getSizeInternal(QPainter& painter, JKQTMathTextEnviro

        if (i<nodes.size() && doDraw) {
            double w, oh, bh, sp;
-            nodes[i]->getSize(painter, currentEv, w, bh, oh, sp, prevNodeSizePtr);
-
+            if (nodeI_SubScript) nodes[i]->getSize(painter, currentEv, w, bh, oh, sp, prevNodeSizePtrForSubscript);
+            else if (nodeI_SuperScript) nodes[i]->getSize(painter, currentEv, w, bh, oh, sp, prevNodeSizePtrForSuperscript);
+            else nodes[i]->getSize(painter, currentEv, w, bh, oh, sp, nullptr);
+            const double cDescent=oh-bh;

            //qDebug()<<"### else:  bh="<<bh<<" baselineHeight="<<baselineHeight<<"   oh="<<oh<<" overallHeight="<<overallHeight;
            if (bh>baselineHeight) {
-                overallHeight=overallHeight+bh-baselineHeight;
+                overallHeight=overallHeight-baselineHeight+bh;
                baselineHeight=bh;
                strikeoutPos=sp;
            }
-            if (baselineHeight+oh-bh>overallHeight) {
-                overallHeight=baselineHeight+oh-bh;
+            if (baselineHeight+cDescent>overallHeight) {
+                overallHeight=baselineHeight+cDescent;
                strikeoutPos=sp;
            }
            //qDebug()<<"### subsupop: else   overallHeight="<<overallHeight<<" baselineHeight="<<baselineHeight;
@ -276,137 +292,156 @@ double JKQTMathTextListNode::draw(QPainter& painter, double x, double y, JKQTMat
    double ynew=y;
    double xnew=x;
    //qDebug()<<"listNode: "<<currentEv.fontSize;
-    QFontMetricsF fm(currentEv.getFont(parentMathText));
-    bool wasBrace=false;
+    const QFontMetricsF fm(currentEv.getFont(parentMathText));
+    const double subsupershift=fm.xHeight()*parentMathText->getOperatorsubsuperDistanceFactor();
+    const double subsuperextrawidth=fm.boundingRect('x').width()*parentMathText->getOperatorsubsuperExtraSpaceFactor();
+    const double subsuperSpecialModeAscent=fm.ascent()*parentMathText->getSubsuperModeSelectionBySizeFactor();
+    const double subsuperSpecialModeDecent=fm.descent()*parentMathText->getSubsuperModeSelectionBySizeFactor();
    for (int i=0; i<nodes.size(); i++) {
        bool doDraw=true;

        JKQTMathTextNodeSize prevNodeSize;
-        JKQTMathTextNodeSize* prevNodeSizePtr=nullptr;
+        JKQTMathTextNodeSize* prevNodeSizePtrForSubscript=nullptr;
+        JKQTMathTextNodeSize* prevNodeSizePtrForSuperscript=nullptr;

-        if (i>0 && wasBrace) {
+        if (i>0) {
            nodes[i-1]->getSize(painter, currentEv, prevNodeSize.width, prevNodeSize.baselineHeight, prevNodeSize.overallHeight, prevNodeSize.strikeoutPos);
-            prevNodeSizePtr=&prevNodeSize;
+            const double prevAscent=prevNodeSize.baselineHeight;
+            const double prevDescent=prevNodeSize.overallHeight-prevNodeSize.baselineHeight;
+            const bool shouldUseSpecialSubscriptMode=prevAscent>=subsuperSpecialModeAscent;
+            const bool shouldUseSpecialSuperscriptMode=prevDescent>=subsuperSpecialModeDecent;
+            if (shouldUseSpecialSubscriptMode)  prevNodeSizePtrForSubscript=&prevNodeSize;
+            if (shouldUseSpecialSuperscriptMode)  prevNodeSizePtrForSuperscript=&prevNodeSize;
        }

+        JKQTMathTextSuperscriptNode* nodeI_SuperScript=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i]);
+        JKQTMathTextSubscriptNode* nodeI_SubScript=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i]);

-        JKQTMathTextSymbolNode* smb=dynamic_cast<JKQTMathTextSymbolNode*>(nodes[i]);
        // if we find a subscript/superscript node we check whether the next node is super/subscript
        // if so, we typeset them at the same x-psotion, so sub/superscripts appear correctly
-        if (dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i])) {
+        if (nodeI_SuperScript) {

            if (i+1<nodes.size()) { // is there one mor node behind?
                if (dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+1])) { // is this subscript?

                    //painter.setPen(QPen("red"));
                    //painter.drawEllipse(xnew-4,ynew+shift-(ccOverallHeight-ccBaselineHeight)-4,8,8);
-                    double xnew1=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtr);
+                    double xnew1=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtrForSuperscript);
                    i++;
                    //painter.setPen(QPen("magenta"));
                    //painter.drawEllipse(xnew-4,ynew-4,8,8);
-                    double xnew2=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtr);
+                    double xnew2=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtrForSubscript);
                    //i++;
                    xnew=qMax(xnew1, xnew2);
                    doDraw=false;
                }
            }
-        } else if (dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i])) {
-            if (i+1<nodes.size()) { // is there one mor node behind?
+        } else if (nodeI_SubScript) {
+            if (i+1<nodes.size()) { // is there one more node behind?
                if (dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+1])) { // is this subscript?
                    //painter.setPen(QPen("red"));
                    //painter.drawEllipse(xnew-4,ynew+shift-(ccOverallHeight-ccBaselineHeight)-4,8,8);
-                    double xnew1=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtr);
+                    double xnew1=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtrForSubscript);
                    i++;
                    //painter.setPen(QPen("magenta"));
                    //painter.drawEllipse(xnew-4,ynew-4,8,8);
-                    double xnew2=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtr);
+                    double xnew2=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtrForSuperscript);
                    //i++;
                    xnew=qMax(xnew1, xnew2);
                    doDraw=false;
                }
            }
        } else {
-            if (smb) {
-                QString s=smb->getSymbolName();
-                if (subsupOperations.contains(s)) {
-                    JKQTMathTextSubscriptNode* subn=nullptr;
-                    if (i+1<nodes.size()) subn=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+1]);
-                    JKQTMathTextSuperscriptNode* supn=nullptr;
-                    if (i+2<nodes.size()) supn=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+2]);
-                    //std::cout<<"symbol ='"<<s.toStdString()<<"'   subn="<<subn<<"   supn="<<supn<<"\n";
-                    if (subn && supn) { // is this subscript and superscript?
-                        JKQTMathTextEnvironment ev=currentEv;
-                        ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
-                        double w1=0, w2=0, w3=0;
-                        double oh1=0, oh2=0, oh3=0;
-                        double bh1=0, bh2=0, bh3=0, sp;
-                        nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp);
-                        subn->getChild()->getSize(painter, ev, w2, bh2, oh2, sp);
-                        supn->getChild()->getSize(painter, ev, w3, bh3, oh3, sp);
-                        double d1=oh1-bh1;
-                        //double d2=oh2-bh2;
-                        double d3=oh3-bh3;

-                        double w=qMax(qMax(w1, w2), w3);
-                        //double xnew1=
-                        double xn1=nodes[i]->draw(painter, xnew+(w-w1)/2.0, ynew, currentEv);
-                        i++;
-                        //double xnew2=
-                        double xn2=subn->getChild()->draw(painter, xnew+(w-w2)/2.0, ynew+bh2+d1, ev);
-                        i++;
-                        //double xnew3=
-                        double xn3=supn->getChild()->draw(painter, xnew+(w-w3)/2.0, ynew-bh1-d3-fm.xHeight()/4.0, ev);
-                        doDraw=false;
-                        xnew=qMax(qMax(xn1, xn2), xn3)+fm.boundingRect(' ').width();
-                    } else if (subn) { // is this subscript and not superscript?
-                        JKQTMathTextEnvironment ev=currentEv;
-                        ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
-                        double w1=0, w2=0;
-                        double oh1=0, oh2=0;
-                        double bh1=0, bh2=0, sp=0;
-                        nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp);
-                        subn->getChild()->getSize(painter, ev, w2, bh2, oh2, sp);
-                        double d1=oh1-bh1;
-                        //double d2=oh2-bh2;
+            if (nodes[i]->isSubSuperscriptAboveBelowNode()) {
+                JKQTMathTextSubscriptNode* subn=nullptr;
+                JKQTMathTextSuperscriptNode* supn=nullptr;
+                JKQTMathTextSubscriptNode* subn2=nullptr;
+                JKQTMathTextSuperscriptNode* supn2=nullptr;
+                if (i+1<nodes.size()) {
+                    subn=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+1]);
+                    supn=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+1]);
+                }
+                if (i+2<nodes.size()) {
+                    subn2=dynamic_cast<JKQTMathTextSubscriptNode*>(nodes[i+2]);
+                    supn2=dynamic_cast<JKQTMathTextSuperscriptNode*>(nodes[i+2]);
+                }
+                //std::cout<<"symbol ='"<<s.toStdString()<<"'   subn="<<subn<<"   supn="<<supn<<"\n";
+                if ((subn && supn2) || (subn2 && supn)) { // is this subscript and superscript  or superscript and subscript?
+                    if (!subn) subn=subn2;
+                    if (!supn) supn=supn2;
+                    JKQTMathTextEnvironment ev=currentEv;
+                    ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
+                    double w1=0, wsub=0, wsup=0;
+                    double oh1=0, ohsub=0, ohsup=0;
+                    double bh1=0, bhsub=0, bhsup=0, spsub, spsup, sp;
+                    nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp);
+                    subn->getChild()->getSize(painter, ev, wsub, bhsub, ohsub, spsub);
+                    supn->getChild()->getSize(painter, ev, wsup, bhsup, ohsup, spsup);
+                    const double descent1=oh1-bh1;
+                    //double d2=oh2-bh2;
+                    const double descent3=ohsup-bhsup;

-                        double w=qMax(w1, w2);
-                        //double xnew1=
-                        double xn2=nodes[i]->draw(painter, xnew+(w-w1)/2.0, ynew, currentEv);
-                        i++;
-                        //double xnew2=
-                        double xn1=subn->getChild()->draw(painter, xnew+(w-w2)/2.0, ynew+bh2+d1, ev)+fm.boundingRect(' ').width();
-                        doDraw=false;
-                        //xnew+=w;
-                        xnew=qMax(xn1, xn2);
-                    } else if (supn) { // is this subscript and superscript?
-                        JKQTMathTextEnvironment ev=currentEv;
-                        ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
-                        double w1=0,  w3=0;
-                        double oh1=0,  oh3=0;
-                        double bh1=0,  bh3=0, sp;
-                        nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp);
-                        supn->getChild()->getSize(painter, ev, w3, bh3, oh3, sp);
-                        //double d1=oh1-bh1;
-                        //double d2=oh2-bh2;
-                        double d3=oh3-bh3;
+                    const double neww=qMax(qMax(w1, wsub), wsup)+subsuperextrawidth;
+                    //double xnew1=
+                    const double xn1=nodes[i]->draw(painter, xnew+(neww-w1)/2.0, ynew, currentEv);
+                    i++;
+                    //double xnew2=
+                    const double xnsub=subn->getChild()->draw(painter, xnew+(neww-wsub)/2.0, ynew+bhsub+descent1+subsupershift, ev);
+                    i++;
+                    //double xnew3=
+                    const double xnsup=supn->getChild()->draw(painter, xnew+(neww-wsup)/2.0, ynew-bh1-descent3-subsupershift, ev);
+                    doDraw=false;
+                    xnew=qMax(qMax(xn1, xnsub), xnsup)+subsuperextrawidth/2.0;
+                } else if (subn) { // is this subscript and no following superscript?
+                    JKQTMathTextEnvironment ev=currentEv;
+                    ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
+                    double w1=0, wsub=0;
+                    double oh1=0, ohsub=0;
+                    double bh1=0, bhsub=0, sp=0, spsub=0;
+                    nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp);
+                    subn->getChild()->getSize(painter, ev, wsub, bhsub, ohsub, spsub);
+                    const double descent1=oh1-bh1;
+                    //double d2=oh2-bh2;

-                        double w=qMax(w1, w3);
-                        //double xnew1=
-                        double xn1=nodes[i]->draw(painter, xnew+(w-w1)/2.0, ynew, currentEv);
-                        i++;
-                        //double xnew3=
-                        double xn3=supn->getChild()->draw(painter, xnew+(w-w3)/2.0, ynew-bh1-d3-fm.xHeight()/4.0, ev);
-                        doDraw=false;
-                        xnew=qMax(xn1, xn3)+fm.boundingRect(' ').width();
-                    }
+                    const double neww=qMax(w1, wsub)+subsuperextrawidth;
+                    //double xnew1=
+                    const double xn1=nodes[i]->draw(painter, xnew+(neww-w1)/2.0, ynew, currentEv);
+                    i++;
+                    //double xnew2=
+                    const double xnsub=subn->getChild()->draw(painter, xnew+(neww-wsub)/2.0, ynew+bhsub+descent1+subsupershift, ev)+subsupershift;
+                    doDraw=false;
+                    //xnew+=w;
+                    xnew=qMax(xnsub, xn1)+subsuperextrawidth/2.0;
+                } else if (supn) { // is this superscript and no following subscript?
+                    JKQTMathTextEnvironment ev=currentEv;
+                    ev.fontSize=ev.fontSize*parentMathText->getOperatorsubsuperSizeFactor();
+                    double w1=0,  wsup=0;
+                    double oh1=0,  ohsup=0;
+                    double bh1=0,  bhsup=0, sp, spsup;
+                    nodes[i]->getSize(painter, currentEv, w1, bh1, oh1, sp);
+                    supn->getChild()->getSize(painter, ev, wsup, bhsup, ohsup, spsup);
+                    //double d1=oh1-bh1;
+                    //double d2=oh2-bh2;
+                    const double descent3=ohsup-bhsup;
+
+                    const double neww=qMax(w1, wsup)+subsuperextrawidth;
+                    //double xnew1=
+                    const double xn1=nodes[i]->draw(painter, xnew+(neww-w1)/2.0, ynew, currentEv);
+                    i++;
+                    //double xnew3=
+                    const double xnsup=supn->getChild()->draw(painter, xnew+(neww-wsup)/2.0, ynew-bh1-descent3-subsupershift, ev);
+                    doDraw=false;
+                    xnew=qMax(xn1, xnsup)+subsuperextrawidth/2.0;
                }
            }
        }

        if (i<nodes.size() && doDraw) {
-            xnew=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtr);
+            if (nodeI_SuperScript) xnew=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtrForSuperscript);
+            else if (nodeI_SubScript) xnew=nodes[i]->draw(painter, xnew, ynew, currentEv, prevNodeSizePtrForSubscript);
+            else xnew=nodes[i]->draw(painter, xnew, ynew, currentEv, nullptr);
        }
-        wasBrace=dynamic_cast<JKQTMathTextBraceNode*>(nodes[i]);
    }
    return xnew;
 }
@ -437,7 +472,7 @@ int JKQTMathTextListNode::childCount() const
 }


-void JKQTMathTextListNode::clearChildren(bool deleteChildren)
+void JKQTMathTextListNode::clearChildrenImpl(bool deleteChildren)
 {
    if (deleteChildren) {
        for (int i=0; i<nodes.size(); i++) {
@ -447,6 +482,11 @@ void JKQTMathTextListNode::clearChildren(bool deleteChildren)
    nodes.clear();
 }

+void JKQTMathTextListNode::clearChildren(bool deleteChildren)
+{
+    clearChildrenImpl(deleteChildren);
+}
+
 JKQTMathTextNode *JKQTMathTextListNode::getChild(int i)
 {
    return nodes[i];
--- a/lib/jkqtmathtext/nodes/jkqtmathtextlistnode.h
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextlistnode.h
@ -34,6 +34,10 @@ class JKQTMathText; // forward

 /** \brief subclass representing a list of nodes in the syntax tree
 *  \ingroup jkqtmathtext_items
+ *
+ *  \note This type of node also implements typesetting sub-/superscript above/below the previous node (if
+ *        JKQTMathTextNode::is() is \c true for that previus node. The drawing is done as defined in the
+ *        following image \image html jkqtmathtext_subsuper_with_limits.png
 */
 class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextListNode: public JKQTMathTextMultiChildNode {
    public:
@ -63,8 +67,9 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextListNode: public JKQTMathTextMultiChil
        /** \copydoc JKQTMathTextNode::getSizeInternal() */
        virtual void getSizeInternal(QPainter& painter, JKQTMathTextEnvironment currentEv, double& width, double& baselineHeight, double& overallHeight, double& strikeoutPos, const JKQTMathTextNodeSize* prevNodeSize=nullptr) override;
        QList<JKQTMathTextNode*> nodes;
-        /** \brief the instructions in this can have the sub-script/superscript set below/above, not besides the node */
-        static QSet<QString> subsupOperations;
+    private:
+        /** \brief  internal implementation of clearChildren() that is non-virtual, so can be used in the destructor */
+        void clearChildrenImpl(bool deleteChildren);
 };

 #endif // JKQTMATHTEXTLISTNODE_H
--- a/lib/jkqtmathtext/nodes/jkqtmathtextnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextnode.cpp
@ -41,7 +41,8 @@
 JKQTMathTextNode::JKQTMathTextNode(JKQTMathText *_parent):
    parentMathText(_parent),
    parentNode(nullptr),
-    drawBoxes(false)
+    drawBoxes(false),
+    subSuperscriptAboveBelowNode(false)
 {

 }
@ -140,6 +141,16 @@ const JKQTMathTextNode *JKQTMathTextNode::getParentNode() const
    return parentNode;
 }

+bool JKQTMathTextNode::isSubSuperscriptAboveBelowNode() const
+{
+    return subSuperscriptAboveBelowNode;
+}
+
+void JKQTMathTextNode::setSubSuperscriptAboveBelowNode(bool __value)
+{
+    subSuperscriptAboveBelowNode=__value;
+}
+
 JKQTMathTextSingleChildNode::JKQTMathTextSingleChildNode(JKQTMathTextNode *_child, JKQTMathText *parentMathText):
    JKQTMathTextNode(parentMathText),
    child(_child)
@ -302,6 +313,26 @@ QList<const JKQTMathTextNode *> JKQTMathTextMultiChildNode::getChildren() const
    return l;
 }

+JKQTMathTextNode *JKQTMathTextMultiChildNode::getFirstChild()
+{
+    return getChild(0);
+}
+
+const JKQTMathTextNode *JKQTMathTextMultiChildNode::getFirstChild() const
+{
+    return getChild(0);
+}
+
+JKQTMathTextNode *JKQTMathTextMultiChildNode::getLastChild()
+{
+    return getChild(childCount()-1);
+}
+
+const JKQTMathTextNode *JKQTMathTextMultiChildNode::getLastChild() const
+{
+    return getChild(childCount()-1);
+}
+
 void JKQTMathTextMultiChildNode::replaceAndDeleteChild(int i, JKQTMathTextNode *newChild)
 {
    JKQTMathTextNode* oldC=replaceChild(i, newChild);
@ -311,6 +342,16 @@ void JKQTMathTextMultiChildNode::replaceAndDeleteChild(int i, JKQTMathTextNode *
    }
 }

+bool JKQTMathTextMultiChildNode::hasChildren() const
+{
+    return childCount()>0;
+}
+
+bool JKQTMathTextMultiChildNode::isEmpty() const
+{
+    return childCount()==0;
+}
+
 void JKQTMathTextMultiChildNode::setDrawBoxes(bool draw)
 {
    JKQTMathTextNode::setDrawBoxes(draw);
--- a/lib/jkqtmathtext/nodes/jkqtmathtextnode.h
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextnode.h
@ -84,6 +84,11 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextNode {
        JKQTMathTextNode* getParentNode();
        /** \copydoc parentNode */
        const JKQTMathTextNode* getParentNode() const;
+        /** \copydoc subSuperscriptAboveBelowNode */
+        bool isSubSuperscriptAboveBelowNode() const;
+        /** \copydoc subSuperscriptAboveBelowNode */
+        void setSubSuperscriptAboveBelowNode(bool __value);
+
    protected:
        /** \brief determine the size of the node, overwrite this function in derived classes
         *
@ -104,6 +109,12 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextNode {
        JKQTMathTextNode* parentNode;
        /** \brief enables the drawing of colored boxes (for DEBUGGING) around the actual output of the node */
        bool drawBoxes;
+        /** \brief if \c true then following sub- and/or superscripts are placed below and above the node, not besides it.
+         *         This is activated when \c \\sum\\limits_{sub}^{sup} is used in LaTeX instead of simply \c \\sum_{sub}^{sup}
+         *
+         *  The default is c false
+         */
+        bool subSuperscriptAboveBelowNode;
        /** \brief draws colored boxes (for DEBUGGING) around the actual output of the node
         *
         * \param painter QPainter to use
@ -189,6 +200,15 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextMultiChildNode: public JKQTMathTextNod
        /** \brief returns the i-th child node */
        virtual const JKQTMathTextNode* getChild(int i) const=0;

+        /** \brief returns the first child node */
+        virtual JKQTMathTextNode* getFirstChild();
+        /** \brief returns the first child node */
+        virtual const JKQTMathTextNode* getFirstChild() const;
+        /** \brief returns the last child node */
+        virtual JKQTMathTextNode* getLastChild();
+        /** \brief returns the last child node */
+        virtual const JKQTMathTextNode* getLastChild() const;
+
        /** \brief replaces the i-th child node with the node \a newChild , returns the replaced old node */
        virtual JKQTMathTextNode* replaceChild(int i, JKQTMathTextNode* newChild) =0;

@ -197,6 +217,10 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextMultiChildNode: public JKQTMathTextNod

        /** \brief returns the number of child nodes */
        virtual int childCount() const =0;
+        /** \brief returns \c true if children exist */
+        bool hasChildren() const;
+        /** \brief returns \c true if there are no children */
+        bool isEmpty() const;

        /** \brief clear all children, deleting them if \a deleteChildren==true */
        virtual void clearChildren(bool deleteChildren=true) =0;
--- a/lib/jkqtmathtext/nodes/jkqtmathtextsubsupernode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextsubsupernode.cpp
@ -49,16 +49,19 @@ void JKQTMathTextSuperscriptNode::getSizeInternal(QPainter& painter, JKQTMathTex
    JKQTMathTextEnvironment ev=currentEv;
    ev.fontSize=ev.fontSize*parentMathText->getSubsuperSizeFactor();
    const QFontMetricsF fm(currentEv.getFont(parentMathText), painter.device());
-    const QRectF tbr=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());
-    double cstrikeoutPos=0;
-    getChild()->getSize(painter, ev, width, baselineHeight, overallHeight, cstrikeoutPos);
-    double shift=parentMathText->getSuperShiftFactor()*tbr.height();
+    const QRectF tbr_of_letterM=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());
+    double cStrikeoutPos=0, cWidth=0, cBaselineHeight=0, cOverallHeight=0;
+    getChild()->getSize(painter, ev, cWidth, cBaselineHeight, cOverallHeight, cStrikeoutPos);
+    const double childDescent=cOverallHeight-cBaselineHeight;
+    double shiftToChildBottom=parentMathText->getSuperShiftFactor()*tbr_of_letterM.height();

-    if (prevNodeSize!=nullptr && prevNodeSize->baselineHeight>tbr.height()) {
-        shift=prevNodeSize->baselineHeight-(overallHeight-baselineHeight)-shift;
+    if (prevNodeSize!=nullptr) {
+        const double modifiedShift=prevNodeSize->baselineHeight-childDescent-parentMathText->getSpecialSuperShiftFactor()*cBaselineHeight-childDescent;
+        if (modifiedShift>shiftToChildBottom) shiftToChildBottom=modifiedShift;
    }

-    baselineHeight=overallHeight=overallHeight+shift;
+    baselineHeight=overallHeight=cOverallHeight+shiftToChildBottom;
+    width=cWidth;
    if (prevNodeSize!=nullptr) strikeoutPos=prevNodeSize->strikeoutPos;
    else strikeoutPos=fm.strikeOutPos();
    if (currentEv.italic && prevNodeSize==nullptr) width=width+double(fm.boundingRect(' ').width())*parentMathText->getItalicCorrectionFactor();
@ -72,19 +75,20 @@ double JKQTMathTextSuperscriptNode::draw(QPainter& painter, double x, double y,
    double cWidth, cBaselineHeight, cOverallHeight, cStrikeoutPos;
    getChild()->getSize(painter, ev, cWidth, cBaselineHeight, cOverallHeight, cStrikeoutPos);

-    QFontMetricsF fm(currentEv.getFont(parentMathText), painter.device());
-    QRectF tbr=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());
-    double shift=parentMathText->getSuperShiftFactor()*tbr.height();
+    const QFontMetricsF fm(currentEv.getFont(parentMathText), painter.device());
+    QRectF tbr_of_letterM=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());
+    const double childDescent=cOverallHeight-cBaselineHeight;
+    double shiftToChildBottom=parentMathText->getSuperShiftFactor()*tbr_of_letterM.height();

-    if (prevNodeSize!=nullptr && prevNodeSize->baselineHeight>tbr.height()) {
-        shift=prevNodeSize->baselineHeight-(cOverallHeight-cBaselineHeight)-shift;
+    if (prevNodeSize!=nullptr) {
+        const double modifiedShift=prevNodeSize->baselineHeight-childDescent-parentMathText->getSpecialSuperShiftFactor()*cBaselineHeight-childDescent;
+        if (modifiedShift>shiftToChildBottom) shiftToChildBottom=modifiedShift;
    }

-    double yshift=shift+cOverallHeight-cBaselineHeight;
    double xx=x;
    if (currentEv.italic && prevNodeSize==nullptr) xx=xx+double(fm.boundingRect(' ').width())*parentMathText->getItalicCorrectionFactor();

-    return getChild()->draw(painter, xx, y-yshift, ev);//+0.5*fm.boundingRect("A").width();
+    return getChild()->draw(painter, xx, y-(shiftToChildBottom+childDescent), ev);//+0.5*fm.boundingRect("A").width();
 }


@ -120,20 +124,27 @@ JKQTMathTextSubscriptNode::~JKQTMathTextSubscriptNode() {
 void JKQTMathTextSubscriptNode::getSizeInternal(QPainter& painter, JKQTMathTextEnvironment currentEv, double& width, double& baselineHeight, double& overallHeight, double& strikeoutPos, const JKQTMathTextNodeSize* prevNodeSize) {
    JKQTMathTextEnvironment ev=currentEv;
    ev.fontSize=ev.fontSize*parentMathText->getSubsuperSizeFactor();
+    const QFontMetricsF fm(ev.getFont(parentMathText), painter.device());
+    const QRectF tbr_of_letterM=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());

-    getChild()->getSize(painter, ev, width, baselineHeight, overallHeight, strikeoutPos);
+    double cWidth=0, cBaselineHeight=0, cOverallHeight=0, cStrikeoutPos=0;
+    getChild()->getSize(painter, ev, cWidth, cBaselineHeight, cOverallHeight, cStrikeoutPos);
+    const double childDescent=cOverallHeight-cBaselineHeight;
+    double shift_to_childBaseline=cBaselineHeight-parentMathText->getSubShiftFactor()*tbr_of_letterM.height();

-    QFontMetricsF fm(ev.getFont(parentMathText), painter.device());
-    QRectF tbr=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());
-    double shift=parentMathText->getSubShiftFactor()*tbr.height();
-
-    if (prevNodeSize!=nullptr && prevNodeSize->overallHeight-prevNodeSize->baselineHeight>shift) {
-        shift=-1.0*(prevNodeSize->overallHeight-prevNodeSize->baselineHeight-shift);
+    if (prevNodeSize!=nullptr) {
+        //qDebug()<<"oldshift="<<shift<<", prevNodeSize->overallHeight="<<prevNodeSize->overallHeight<<", prevNodeSize->baselineHeight="<<prevNodeSize->baselineHeight;
+        const double parentDescent=prevNodeSize->overallHeight-prevNodeSize->baselineHeight;
+        const double newShift=parentDescent+parentMathText->getSpecialSubShiftFactor()*cBaselineHeight;
+        if (newShift>shift_to_childBaseline) shift_to_childBaseline=newShift;
+        //qDebug()<<"newshift="<<shift;
    }

-    baselineHeight=shift;
+    baselineHeight=cBaselineHeight-shift_to_childBaseline;
+    overallHeight=cOverallHeight;
    if (prevNodeSize!=nullptr) strikeoutPos=prevNodeSize->strikeoutPos;
    else strikeoutPos=fm.strikeOutPos();
+    width=cWidth;
    if (currentEv.italic && prevNodeSize==nullptr) width=width-double(fm.boundingRect(' ').width())*parentMathText->getItalicCorrectionFactor();
 }

@ -141,25 +152,26 @@ double JKQTMathTextSubscriptNode::draw(QPainter& painter, double x, double y, JK
    doDrawBoxes(painter, x, y, currentEv);
    JKQTMathTextEnvironment ev=currentEv;
    ev.fontSize=ev.fontSize*parentMathText->getSubsuperSizeFactor();
-    QFontMetricsF fm(ev.getFont(parentMathText), painter.device());
-    QRectF tbr=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());
+    const QFontMetricsF fm(ev.getFont(parentMathText), painter.device());
+    const QRectF tbr_of_letterM=JKQTMathTextGetTightBoundingRect(currentEv.getFont(parentMathText), "M", painter.device());

-    double width=0, baselineHeight=0, overallHeight=0, strikeoutPos=0;
-    getChild()->getSize(painter, ev, width, baselineHeight, overallHeight, strikeoutPos);
-    double shift=parentMathText->getSubShiftFactor()*tbr.height();
+    double cWidth=0, cBaselineHeight=0, cOverallHeight=0, cStrikeoutPos=0;
+    getChild()->getSize(painter, ev, cWidth, cBaselineHeight, cOverallHeight, cStrikeoutPos);
+    double shift_to_childBaseline=cBaselineHeight-parentMathText->getSubShiftFactor()*tbr_of_letterM.height();

-    if (prevNodeSize!=nullptr && prevNodeSize->overallHeight-prevNodeSize->baselineHeight>shift) {
+    if (prevNodeSize!=nullptr) {
        //qDebug()<<"oldshift="<<shift<<", prevNodeSize->overallHeight="<<prevNodeSize->overallHeight<<", prevNodeSize->baselineHeight="<<prevNodeSize->baselineHeight;
-        shift=-1.0*(prevNodeSize->overallHeight-prevNodeSize->baselineHeight-shift);
+        const double parentDescent=prevNodeSize->overallHeight-prevNodeSize->baselineHeight;
+        const double newShift=parentDescent+parentMathText->getSpecialSubShiftFactor()*cBaselineHeight;
+        if (newShift>shift_to_childBaseline) shift_to_childBaseline=newShift;
        //qDebug()<<"newshift="<<shift;
    }

-    double yshift=baselineHeight-shift;
    //qDebug()<<"baselineHeight="<<baselineHeight<<", overallHeight="<<overallHeight<<", strikeoutPos="<<strikeoutPos;
    //qDebug()<<"shift="<<shift<<", yshift="<<yshift;
    double xx=x;
    if (currentEv.italic && prevNodeSize==nullptr) xx=xx-double(fm.boundingRect(' ').width())*parentMathText->getItalicCorrectionFactor();
-    return getChild()->draw(painter, xx, y+yshift, ev);//+0.5*fm.boundingRect("A").width();
+    return getChild()->draw(painter, xx, y+shift_to_childBaseline, ev);//+0.5*fm.boundingRect("A").width();
 }

 QString JKQTMathTextSubscriptNode::getTypeName() const
--- a/lib/jkqtmathtext/nodes/jkqtmathtextsymbolnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextsymbolnode.cpp
@ -633,10 +633,10 @@ bool JKQTMathTextSymbolNode::getUnicodeFullSymbolProp(JKQTMathTextSymbolNode::Sy
    else if (n == "oiint") { props.symbol = QChar(0x222F); props.fontFactor = mathFontFactor; /*yfactor=+0.1;*/ props.heightIsAscent = true; props.exactAscent = true; }
    else if (n == "oiiint") { props.symbol = QChar(0x2230); props.fontFactor = mathFontFactor; /*yfactor=+0.1;*/ props.heightIsAscent = true; props.exactAscent = true; }
    else if (n == "coprod") { props.symbol = QChar(0x2210); props.heightIsAscent = true; props.exactAscent = true; }
-    else if (n == "bigcap") { props.symbol = QChar(0x22C2); props.heightIsAscent = true; props.exactAscent = true; props.heightIsAscent = true; props.exactAscent = true; }
-    else if (n == "bigcup") { props.symbol = QChar(0x22C3); props.heightIsAscent = true; props.exactAscent = true; props.heightIsAscent = true; props.exactAscent = true; }
-    else if (n == "bigvee") { props.symbol = QChar(0x22C1); props.heightIsAscent = true; props.exactAscent = true; props.heightIsAscent = true; props.exactAscent = true; }
-    else if (n == "bighat") { props.symbol = QChar(0x22C0); props.heightIsAscent = true; props.exactAscent = true; props.heightIsAscent = true; props.exactAscent = true; }
+    else if (n == "bigcap") { props.symbol = QChar(0x22C2); props.heightIsAscent = true; props.exactAscent = true; }
+    else if (n == "bigcup") { props.symbol = QChar(0x22C3); props.heightIsAscent = true; props.exactAscent = true; }
+    else if (n == "bigvee") { props.symbol = QChar(0x22C1); props.heightIsAscent = true; props.exactAscent = true; }
+    else if (n == "bighat") { props.symbol = QChar(0x22C0); props.heightIsAscent = true; props.exactAscent = true; }
    else if (n == "int") { props.symbol = QChar(0x222B); props.fontFactor = mathFontFactor; /*yfactor=+0.1;*/ props.heightIsAscent = true; props.exactAscent = true; }
    else {return false;}
    return true;
@ -653,7 +653,7 @@ bool JKQTMathTextSymbolNode::getSymbolProp(JKQTMathTextSymbolNode::SymbolProps&
    props.font = fnt.first;
    if (fnt.second==MTFEunicode) {
        props.font = fnt.first;
-        if (!getUnicodeBaseSymbolProp(props, n) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
+        if (!getUnicodeBaseSymbolProp(props, n) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
            return false;
        }
    } else if (fnt.second==MTFEunicodeLimited) {
@ -661,7 +661,7 @@ bool JKQTMathTextSymbolNode::getSymbolProp(JKQTMathTextSymbolNode::SymbolProps&
        if (!getUnicodeBaseSymbolProp(props, n) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
            if (fntSym.second==MTFEunicode) {
                props.font = fntSym.first;
-                if (!getUnicodeBaseSymbolProp(props, n) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
+                if (!getUnicodeBaseSymbolProp(props, n) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
                    return false;
                }
            } else if (fntSym.second==MTFEunicodeLimited) {
@ -684,7 +684,7 @@ bool JKQTMathTextSymbolNode::getSymbolProp(JKQTMathTextSymbolNode::SymbolProps&
        if (!getWinSymbolProp(props, n, currentEv, mathFontFactor)) {
            if (fntSym.second==MTFEunicode) {
                props.font = fntSym.first;
-                if (!getUnicodeBaseSymbolProp(props, n) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
+                if (!getUnicodeBaseSymbolProp(props, n) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
                    return false;
                }
            } else if (fntSym.second==MTFEunicodeLimited) {
@ -707,7 +707,7 @@ bool JKQTMathTextSymbolNode::getSymbolProp(JKQTMathTextSymbolNode::SymbolProps&
        if (!getStandardTextSymbolProp(props, n)) {
            if (fntSym.second==MTFEunicode) {
                props.font = fntSym.first;
-                if (!getUnicodeBaseSymbolProp(props, n) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
+                if (!getUnicodeBaseSymbolProp(props, n) && !getUnicodeFullSymbolProp(props,n,mathFontFactor) && !getGreekSymbolProp(props, n, currentEv, mathFontFactor)) {
                    return false;
                }
            } else if (fntSym.second==MTFEunicodeLimited) {
@ -1271,12 +1271,14 @@ bool JKQTMathTextSymbolNode::toHtml(QString &html, JKQTMathTextEnvironment curre

    QMap<QString, QString>::iterator itS = entitylut.find(symbolName);
    if (itS!=entitylut.end()) { s=itS.value(); }
-    else if (symbolName == "sum") { ev.fontSize*=1.7; s="&sum;"; }
-    else if (symbolName == "prod") { ev.fontSize*=1.7; s="&prod;"; }
-    else if (symbolName == "bigcap") { ev.fontSize*=1.7; s="&cap;"; }
-    else if (symbolName == "bigcup") { ev.fontSize*=1.7; s="&cup;"; }
-    else if (symbolName == "bigvee") { ev.fontSize*=1.7; s="&or;"; }
-    else if (symbolName == "bighat") { ev.fontSize*=1.7; s="&and;"; }
+    else if (symbolName == "sum") {
+        ev.fontSize*=parentMathText->getBigMathoperatorFontFactor(); s="&sum;"; }
+    else if (symbolName == "prod") {
+        ev.fontSize*=parentMathText->getBigMathoperatorFontFactor(); s="&prod;"; }
+    else if (symbolName == "bigcap") { ev.fontSize*=parentMathText->getBigMathoperatorFontFactor(); s="&cap;"; }
+    else if (symbolName == "bigcup") { ev.fontSize*=parentMathText->getBigMathoperatorFontFactor(); s="&cup;"; }
+    else if (symbolName == "bigvee") { ev.fontSize*=parentMathText->getBigMathoperatorFontFactor(); s="&or;"; }
+    else if (symbolName == "bighat") { ev.fontSize*=parentMathText->getBigMathoperatorFontFactor(); s="&and;"; }
    else ok=false;

    if (ok) html=html+ev.toHtmlStart(defaultEv)+s+ev.toHtmlAfter(defaultEv);