If they don't, flipping will result in corrupted display.
Test case:
- Run Xorg at 1920x1080 with no window manager
- glxgears -geometry 2048x1080
The Present extension code in xserver 1.21 will check for this.
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If they don't, flipping will result in corrupted display.
Test case:
The Present extension code in xserver 1.21 will check for this.