QWidget:paintEvent is received by inactive windows

This was reproduced on X11 and Windows XP as well as embedded Linux using qvfb -qws and tested with Qt 4.5.1 and Qt 4.4.3

To reproduce, a gzipped tar archive is attached to the message from support.This is just a small app that reimplements event() to catch events and test for the following condition:-

is the window active?
if so, is it receiving paint events?

The output is displayed in the application output.

Or use a method like this in any QWidget or QWidget derived class:-

bool MainWindow::event(QEvent* event)
{
if(this->isActiveWindow())

{ pFlag = true; if(event->type() == QEvent::Paint ) qDebug() << "Paint event while main window active"; }

else

{ pFlag = false; }

if(event->type() == QEvent::Paint)
{

if(!this->isActiveWindow())

{ if(pFlag == false) qDebug() << "Paint Event on inactive window before window has been active"; }

}

return QMainWindow::event( event );
}

The problem occurs in Qt 4.5.x but is absent in Qt 4.4.3

This affects performance and causes flicker, particularly noticeable on embedded devices.