Switching from windowed mode to fullscreen causes ANGLE to render the wrong content on initial paint.
Switching back to windowed mode can also cause rendering issues, reproducible on WinRT more easily.
In case another update happens, then the correct content is painted again.
See attached for a minimal example.
|For Gerrit Dashboard: QTBUG-54905|
|195336,4||Workaround for window not getting update on ANGLE after resize||5.9||qt/qtbase||Status: ABANDONED||-1||0|