Andreas Kling 86eae0f8df Let userland retain the window backing store while drawing into it. ...

To start painting, call:
gui$get_window_backing_store()

Then finish up with:
gui$release_window_backing_store()

Process will retain the underlying GraphicsBitmap behind the scenes.
This fixes racing between the WindowServer and GUI clients.

This patch also adds a WSWindowLocker that is exactly what it sounds like.

2019-01-24 23:44:19 +01:00

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