From c0bbe8f55719b01c23d29a94592f29a3722a0aba Mon Sep 17 00:00:00 2001
From: jkriege2 <jan@jkrieger.de>
Date: Wed, 31 Jan 2024 15:47:26 +0100
Subject: [PATCH] FIXED issue <a
 href="https://github.com/jkriege2/JKQtPlotter/issues/117">#117: Unnecessary
 printing of tilde symbol in math</a> (thanks to <a
 href="https://github.com/igormironchik">user:igormironchik</a> for
 reporting):<br/>Tilde was not recognized as a LaTeX instruction, now is
 interpreted as non-breaking whitespace

---
 doc/dox/whatsnew.dox                                 | 1 +
 lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp | 8 ++++++++
 lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.h   | 1 +
 3 files changed, 10 insertions(+)

diff --git a/doc/dox/whatsnew.dox b/doc/dox/whatsnew.dox
index 7ac8e09c6b..35a7ca9cb4 100644
--- a/doc/dox/whatsnew.dox
+++ b/doc/dox/whatsnew.dox
@@ -129,6 +129,7 @@ Changes, compared to  \ref page_whatsnew_V4_0_0 "v4.0.0" include:
     <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, \c +-*... 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: \c \\sum and \c \\prod used the wrong symbol in XITS-mode</li>
+    <li>FIXED issue <a href="https://github.com/jkriege2/JKQtPlotter/issues/117">#117: Unnecessary printing of tilde symbol in math</a> (thanks to <a href="https://github.com/igormironchik">user:igormironchik</a> for reporting):<br/>Tilde was not recognized as a LaTeX instruction, now is interpreted as non-breaking whitespace</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>
diff --git a/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp b/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp
index d5982769da..b26626466a 100644
--- a/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp
+++ b/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp
@@ -561,6 +561,11 @@ JKQTMathTextLatexParser::tokenType JKQTMathTextLatexParser::getToken() {
         //std::cout<<"found ampersand\n";
         return currentToken=MTTampersand;
     //----------------------------------------------------------
+    // check for ~ character
+    } else if (c=='~') {
+        //std::cout<<"found tilde\n";
+        return currentToken=MTTtilde;
+    //----------------------------------------------------------
     // check for { character
     } else if (c=='{') {
         //----------------------------------------------------------
@@ -703,6 +708,8 @@ JKQTMathTextNode* JKQTMathTextLatexParser::parseLatexString(bool get, JKQTMathTe
             break;
         } else if (currentToken==MTTwhitespace) {
             if (!parsingMathEnvironment) nl->addChild(new JKQTMathTextWhitespaceNode(parentMathText));
+        } else if (currentToken==MTTtilde) {
+            nl->addChild(new JKQTMathTextWhitespaceNode(JKQTMathTextWhitespaceNode::WSTNonbreaking, parentMathText));
         } else if (currentToken==MTTendash) {
             nl->addChild(new JKQTMathTextSymbolNode(parentMathText, "endash"));
         } else if (currentToken==MTTemdash) {
@@ -1337,6 +1344,7 @@ QString JKQTMathTextLatexParser::tokenType2String(tokenType type)
       case MTTinstructionVerbatimVisibleSpace: return "MTTinstructionVerbatimVisibleSpace";
       case MTTinstructionBegin: return "MTTinstructionBegin";
       case MTTinstructionEnd: return "MTTinstructionEnd";
+      case MTTtilde: return "MTTtilde";
     }
     return "???";
 }
diff --git a/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.h b/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.h
index 8ebd17b8f7..02c8c05715 100644
--- a/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.h
+++ b/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.h
@@ -92,6 +92,7 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextLatexParser : public JKQTMathTextParse
             MTThyphen,  /*!< \brief the single hyphen character \c "-" in text-mode \note MTTendash and MTTemdash take precedence over MTThypen  */
             MTTendash,  /*!< \brief the en-dash character sequence \c "--" in text-mode */
             MTTemdash,  /*!< \brief the em-dash character sequence \c "---" in text-mode */
+            MTTtilde,   /*!< \brief the tilde character \c "~"  */
 
         };
         /** \brief convert a tokenType into a string, e.g. for debugging output */