On a Windows 7 Platform, when I create a test object derived from QWindow and call the create() function, the window geometry (specifically width) is changed. This change is not seen in Qt4.8 and may be due to changes in the underlying QPA plugins.

For example:

TestView::TestView(QWindow *parent)
    : QWindow(parent)
{
    setGeometry(QRect(50, 50, 100, 100));
    setSurfaceType(QWindow::OpenGLSurface);
    qDebug() << geometry();
    create();
    qDebug() << geometry();
}

Provides the following debug output:

 
QRect(50,50 100x100)
QRect(50,50 116x100)

After create is called the width of the window geometry is now 116, while the height is unchanged. Am I missing some critical aspect of how this should work? As mentioned, Qt 4.8 doesn't seem to exhibit the same result, and Linux & Mac do not change the geometry in this way.