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4a0ac0601e
Dragging the first-boot install/status window could make setup stall,
and the shell never started after that.
The problem is that the move/size modal loop can remove a posted `WM_QUIT`
while setup is tearing the thread down. That quit message then does not
reach the outer `GetMessage()` loop, so the setup thread keeps waiting
instead of exiting.
This fix keeps the `WM_QUIT` message alive by re-posting it and leaving
the move/size loop.
See also: https://devblogs.microsoft.com/oldnewthing/20050222-00/?p=36393
Boot to first-boot setup, drag the install/status window while it is finishing,
and check that setup continues and Explorer starts instead of hanging.
This is a cherry-pick of cf47094103.