Restoring a QMdiSubWindow when QMdiArea viewMode is QMdiArea::TabbedView

When a QMdiArea's viewMode is QMdiArea::SubWindowView (the default), the user can minimize/maximize/restore the sub window via buttons on the QMdiSubWindow's title bar.

When the viewMode is set to QMdiArea::TabbedView, the user can right click on the tabs to display a menu allowing the tab to be closed or restored.

Closing the tab seems to work fine; however restoring the tab produces an odd behavior.

Restoring the tabbed sub window forces all tabbed sub windows to become floating windows. This can be expected. However, the tab bar still remains visible allowing the user multiple ways to interact with the sub window.

Now that the sub window is floating, the user can right click on either the tab or title bar for the sub window and select "Stay on Top".

When the sub windows are returned to tabbed view (by maximizing any floating sub window) the window that was selected to "Stay on Top" is now visibly floating on top of the other tabbed sub windows.

Test case main.cpp to reproduce
================================
#include <QtGui>

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0)
: QMainWindow(parent)

{ QMdiArea *mdiArea = new QMdiArea; mdiArea->setViewMode(QMdiArea::TabbedView); setCentralWidget(mdiArea); QMdiSubWindow *sub1 = mdiArea->addSubWindow(new QTextEdit); QMdiSubWindow *sub2 = mdiArea->addSubWindow(new QTextEdit); QMdiSubWindow *sub3 = mdiArea->addSubWindow(new QTextEdit); }

};

#include "main.moc"

int main(int argc, char **argv)
{
QApplication a(argc, argv);
MainWindow mw;
mw.show();
return a.exec();
}