[Qt-interest] OpenGL & Vista without desktop composition bug !!!

[Vincent LEFORT]

Hello,

We can see a problem under OpenGL with Qt when we run our program (or qt
demo) on Vista when the Aero Theme (desktop compositing) is disabled.

*How to do : *
 - Launch for example the demo 2D painting.
 - Move a window above the opengl widget.
 - Alt+tab to get back the opengl application.

=> The opengl widget only refresh the region which was hidden by the other
window.

This problem appear with some other GUI libraries (like freeGlut or
wxWidget<http://trac.wxwidgets.org/ticket/10168>)
but not on win32 based application.
The problem does neither appear when dektop composition is enabled under
windows vista nor when the application is launched under windows xp so
without any hardware accelerated window rendering.

You can see in attachment a screen shot of the problem.

Do you know any trick to fix this problem ?

Best regards.

Vincent.
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