QTreeWidget + Persistent Editor problem

Hello,

I have some very simple code that places QToolButtons in some cells in a QTreeWidget. The problem is that I use a persistent editor to place QToolButtons in 2 columns, then move column 0 to column 2 (there are 4 columns in total). On a x64 release build, this results in two buttons being drawn *on top* of each other. (screencap attached)

It works fine when compiled as a 32bit application, but does not work properly with compiled as a x64 application. Strangely, my x64 debug build of the application also works as I expect.

This is using Qt 4.3.4 on a WinXp Pro x64 SP2 machine with the vs2005 compiler.

The sample code looks like this:

Code:

---

class tempEdit2 : public QItemDelegate
{
QWidget * createEditor(QWidget *parent, const QStyleOptionViewItem & option, const QModelIndex &index) const
{
	return new QToolButton(parent);
};
 
};
 
int main(int argc, char** argv) {
 
	QApplication app(argc,argv);
	QMainWindow w;
 
	QTreeWidget* mWidget = new QTreeWidget( qApp->mainWidget() );
 
	mWidget->setColumnCount(4);
	mWidget->setItemDelegate( new tempEdit2 );
 
	mWidget->header()->moveSection( 0, 2 ); // this screws up the layout.
	mWidget->show();
 
	QTreeWidgetItem* item = new QTreeWidgetItem( mWidget, QTreeWidgetItem::Type );
	mWidget->openPersistentEditor(item,1);
	mWidget->openPersistentEditor(item,2);
 
	w.show();
	app.exec();
}

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