QWindowsVistaStyle/QMdiSubWindow too small when minimized

This occurs with the MDI sample that comes with Qt and the Windows Vista Style. It does not occur with Fusion or Windows Classic style. If we create several MDI subwindows and then minimize one, the area the subwindow is resized to only includes the restore, maximize, and close buttons but not the title or icon. Native Win32 MDI is supposed to include the title and icon so you can left click on the icon to access the system menu of the subwindow even when it's minimized. Perhaps the minimum size of QMdiSubWindow is not including the framesize?

I believe this to be a regression because I do recall it correctly minimizing the subwindow in a previous Qt release. Also, as I said already, it's only "incorrect" under the Windows Vista style. In fact, I remember testing specifically this because it used to be broke in Java Swing and I distinctly remember that it worked in Qt.

I've attached here a screenshot of me reproducing the issue with the MDI sample that comes with the latest Qt which is the only one I have installed.