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[BUG] GLDraw on multiple window on the same time doesn't work
https://www.ultimatepp.org/forums/index.php?t=rview&goto=42980&th=8882#msg_42980
I have got some problems with GLDraw. It seems that it can draw exactly to one window on the same time. When I am creating new window the whole area is black (See screenshot below!).
I have also exhaustive test case. It bases on package reference/GLDrawDemo. The correct result of this test case should be two the same images on both windows.