From Ozgur Ugras BARAN: Fix bug 3529

* src/frontends/qt4/TocWidget.{cpp,h}:
	-  new member disconnectSelectionModel()
	- (select): replace blockSignal() directives for tocTV selectionModel() 
	   with disconnect (the above new function) and reconnect relevant signal

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18338 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt4/TocWidget.cpp

@@ -106,7 +106,8 @@ depth calculation.
 int TocWidget::getIndexDepth(QModelIndex const & index, int depth)
 {
 	++depth;
-	return (index.parent() == QModelIndex())? depth : getIndexDepth(index.parent(),depth);
+	return (index.parent() ==
+		QModelIndex())? depth : getIndexDepth(index.parent(),depth);
 }
 
 
@@ -205,12 +206,10 @@ void TocWidget::select(QModelIndex const & index)
 		return;
 	}
 
-	tocTV->selectionModel()->blockSignals(true);
+	disconnectSelectionModel();
-	tocTV->selectionModel()->clear();
+	tocTV->setCurrentIndex(index);
-	tocTV->scrollTo(index);
+ 	tocTV->scrollTo(index);
-	tocTV->selectionModel()->setCurrentIndex(index,
+	reconnectSelectionModel();
-		QItemSelectionModel::ClearAndSelect);
-	tocTV->selectionModel()->blockSignals(false);
 }
 
 
@@ -307,8 +306,21 @@ void TocWidget::setTocModel(size_t type)
 void TocWidget::reconnectSelectionModel()
 {
 	connect(tocTV->selectionModel(),
-		SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
+		SIGNAL(currentChanged(const QModelIndex &,
-		this, SLOT(selectionChanged(const QModelIndex &, const QModelIndex &)));
+		       const QModelIndex &)),
+		this,
+		SLOT(selectionChanged(const QModelIndex &,
+		     const QModelIndex &)));
+}
+
+void TocWidget::disconnectSelectionModel()
+{
+	disconnect(tocTV->selectionModel(),
+		   SIGNAL(currentChanged(const QModelIndex &, 
+			  const QModelIndex &)),
+		   this,
+		   SLOT(selectionChanged(const QModelIndex &,
+			const QModelIndex &)));
 }
 
 } // namespace frontend

src/frontends/qt4/TocWidget.h

@@ -60,6 +60,9 @@ protected:
 private:
 	/// Reconnects the selection model change signal when TOC changed.
 	void reconnectSelectionModel();
+	/// Disconnects the selection model.
+	//This is a workaround for a problem of signals blocking.
+	void disconnectSelectionModel();
 
 	QToc * form_;