Fixup [152811a27d242/lyxgit]

tabBarClicked() should really only reset focus if a click in a different
TabBarGroup happened. And no need to issue workAreaChanged() again.

This has lead to extra and erroneous focus changes (see #12954)

(cherry picked from commit 026c4bd726)

src/frontends/qt/GuiView.cpp

@@ -1926,6 +1926,12 @@ GuiWorkArea const * GuiView::currentWorkArea() const
 }
 
 
+TabWorkArea * GuiView::currentTabWorkArea() const
+{
+	return d.currentTabWorkArea();
+}
+
+
 GuiWorkArea * GuiView::currentWorkArea()
 {
 	return d.current_work_area_;

src/frontends/qt/GuiView.h

@@ -209,6 +209,8 @@ public:
 	void removeWorkArea(GuiWorkArea * work_area);
 	/// return true if \c wa is one of the visibles workareas of this view
 	bool hasVisibleWorkArea(GuiWorkArea * wa) const;
+	///
+	TabWorkArea * currentTabWorkArea() const;
 	/// return the current WorkArea (the one that has the focus).
 	GuiWorkArea const * currentWorkArea() const;
 	/// return the current WorkArea (the one that has the focus).

src/frontends/qt/GuiWorkArea.cpp

@@ -1648,7 +1648,7 @@ TabWorkArea::TabWorkArea(QWidget * parent)
 		this, SLOT(on_currentTabChanged(int)));
 	// Fix for #11835
 	QObject::connect(this, SIGNAL(tabBarClicked(int)),
-		this, SLOT(on_currentTabChanged(int)));
+		this, SLOT(on_tabBarClicked(int)));
 
 	closeBufferButton = new QToolButton(this);
 	closeBufferButton->setPalette(pal);
@@ -1928,6 +1928,22 @@ bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
 }
 
 
+void TabWorkArea::on_tabBarClicked(int i)
+{
+	// returns e.g. on application destruction
+	if (i == -1)
+		return;
+
+	// if we click on a tab in a different TabWorkArea,
+	// focus needs to be set (#11835)
+	if (currentWorkArea() && currentWorkArea()->view().currentTabWorkArea() != this) {
+		GuiWorkArea * wa = workArea(i);
+		LASSERT(wa, return);
+		wa->setFocus();
+	}
+}
+
+
 void TabWorkArea::on_currentTabChanged(int i)
 {
 	// returns e.g. on application destruction

src/frontends/qt/GuiWorkArea.h

@@ -265,6 +265,8 @@ private Q_SLOTS:
 	///
 	void on_currentTabChanged(int index);
 	///
+	void on_tabBarClicked(int index);
+	///
 	void showContextMenu(const QPoint & pos);
 	/// enable closing tab on middle-click
 	void mousePressEvent(QMouseEvent * me) override;