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CORE-18206 CORE-18799 CORE-19371
Fixes infinite loop of:
err: Message WM_PAINT count 1 Internal Paint Set? FALSE
The symptom appears in the following scenario (as reported in CORE-18799):
A program (game) runs at a small resolution (e.g. 640 x 480), but the
game window gets invalidated at a larger size (e.g. 1152 x 864 screen
resolution) before switching to the smaller (640 x 480) size.
Because of this, the window's update region is larger than the current
window so only the 640 x 480 region gets validated leaving the remaining
region invalid. This causes the recurring WM_PAINT messages because there
is no way to invalidate the remaining area.
This is a backport of commit:
5c505d9a9b [NTUSER] Handle window update region larger than the current window in clip region (#7731)