Fixed showing of dock area when inserting a dock widget into a hidden dock area

fixed setting of DockAreaTabBar index to prevent showing of tab 0 when inserting a dock widget into an area with no current index tab

examples/deleteonclose/deleteonclose.pro

@@ -0,0 +1,39 @@
+ADS_OUT_ROOT = $${OUT_PWD}/../..
+
+QT += core gui widgets
+
+TARGET = DeleteOnCloseTest
+DESTDIR = $${ADS_OUT_ROOT}/lib
+TEMPLATE = app
+CONFIG += c++14
+CONFIG += debug_and_release
+adsBuildStatic {
+    DEFINES += ADS_STATIC
+}
+
+DEFINES += QT_DEPRECATED_WARNINGS
+
+SOURCES += main.cpp
+
+
+LIBS += -L$${ADS_OUT_ROOT}/lib
+
+# Dependency: AdvancedDockingSystem (shared)
+CONFIG(debug, debug|release){
+    win32 {
+        LIBS += -lqtadvanceddockingd
+    }
+    else:mac {
+        LIBS += -lqtadvanceddocking_debug
+    }
+    else {
+        LIBS += -lqtadvanceddocking
+    }
+}
+else{
+    LIBS += -lqtadvanceddocking
+}
+
+INCLUDEPATH += ../../src
+DEPENDPATH += ../../src    
+

examples/deleteonclose/main.cpp

@@ -0,0 +1,41 @@
+#include <QMainWindow>
+#include <QAction>
+#include <QTextEdit>
+#include <QApplication>
+#include <QMenuBar>
+#include "DockManager.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    QMainWindow w;
+
+    auto dockManager = new ads::CDockManager(&w);
+
+    QAction *action = new QAction("New Delete On Close", &w);
+    w.menuBar()->addAction(action);
+
+    int i = 0;
+    QObject::connect(action, &QAction::triggered, [&]() {
+        auto dw = new ads::CDockWidget(QStringLiteral("test doc %1").arg(i++), &w);
+        auto editor = new QTextEdit(QStringLiteral("lorem ipsum..."), dw);
+        dw->setWidget(editor);
+        dw->setFeature(ads::CDockWidget::DockWidgetDeleteOnClose, true);
+        auto area = dockManager->addDockWidgetTab(ads::CenterDockWidgetArea, dw);
+        qDebug() << "doc dock widget created!" << dw << area;
+    });
+
+    action = new QAction("New", &w);
+    w.menuBar()->addAction(action);
+    QObject::connect(action, &QAction::triggered, [&]() {
+        auto dw = new ads::CDockWidget(QStringLiteral("test %1").arg(i++), &w);
+        auto editor = new QTextEdit(QStringLiteral("lorem ipsum..."), dw);
+        dw->setWidget(editor);
+        auto area = dockManager->addDockWidgetTab(ads::CenterDockWidgetArea, dw);
+        qDebug() << "dock widget created!" << dw << area;
+    });
+
+    w.show();
+
+    return a.exec();
+}

examples/examples.pro

@@ -2,4 +2,5 @@ TEMPLATE = subdirs
 
 SUBDIRS = \
 	simple \
-	sidebar
+	sidebar \
+	deleteonclose

src/DockAreaTabBar.cpp

@@ -205,10 +205,14 @@ void CDockAreaTabBar::insertTab(int Index, CDockWidgetTab* Tab)
 	connect(Tab, SIGNAL(elidedChanged(bool)), this, SIGNAL(elidedChanged(bool)));
 	Tab->installEventFilter(this);
 	emit tabInserted(Index);
-	if (Index <= d->CurrentIndex || d->CurrentIndex == -1)
+    if (Index <= d->CurrentIndex)
 	{
 		setCurrentIndex(d->CurrentIndex + 1);
-	}
+    }
+    else if (d->CurrentIndex == -1)
+    {
+    	setCurrentIndex(Index);
+    }
 
 	updateGeometry();
 }

src/DockAreaWidget.cpp

@@ -429,6 +429,12 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 		setCurrentIndex(index);
 	}
 	DockWidget->setDockArea(this);
+	// If this dock area is hidden, then we need to make it visible again
+	// by calling DockWidget->toggleViewInternal(true);
+	if (!this->isVisible() && d->ContentsLayout->count() > 1 && !dockManager()->isRestoringState())
+	{
+		DockWidget->toggleViewInternal(true);
+	}
 	d->updateTitleBarButtonStates();
 }
 
@@ -448,7 +454,7 @@ void CDockAreaWidget::removeDockWidget(CDockWidget* DockWidget)
 	{
 		setCurrentDockWidget(NextOpenDockWidget);
 	}
-	else if (d->ContentsLayout->isEmpty() && DockContainer->dockAreaCount() > 1)
+	else if (d->ContentsLayout->isEmpty() && DockContainer->dockAreaCount() >= 1)
 	{
         ADS_PRINT("Dock Area empty");
 		DockContainer->removeDockArea(this);

src/DockWidgetTab.cpp

@@ -570,7 +570,7 @@ void CDockWidgetTab::mouseDoubleClickEvent(QMouseEvent *event)
 void CDockWidgetTab::setVisible(bool visible)
 {
 	// Just here for debugging to insert debug output
-	Super::setVisible(visible);
+    Super::setVisible(visible);
 }