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screen-cast/area-src: Clear framebuffer before painting stage

Jonas Ådahl requested to merge jadahl/mutter:wip/clear-screen-cast-buffer into master

We'll be painting to a framebuffer that may not be completely covered by the painted areas, meaning the not painted areas would end up undefined, thus potentially contain garbage or old content.

Avoid this by clearing the framebuffer before painting the stage.

Closes: #1442 (closed)

Disclaimer: I haven't verified this fixes the issue.

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