Tom 0547e0329a WindowServer: Fix artifacts after window resize in some cases ...

We were calculating the old window rectangle after changing window
states that may affect these calculations, which sometimes resulted
in artifacts left on the screen, particularily when tiling a window
as this now also constrains rendering to one screen.

Instead, just calculate the new rectangle and use the window's
occlusion information to figure out what areas need to be invalidated.

2021-06-20 14:57:26 +02:00

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