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GPU optimizations for partial surface update

msizanoen1 requested to merge msizanoen1/mutter:optimize-partial-redraw into main

This aims to reduce the amount of pixels redrawn on the screen (and therefore power consumption) in the following cases:

  • The application submitted two different damage areas in a single frame that are sufficiently far apart to result in a substantially larger redraw area than actually needed
  • The application submitted a damage area that is partially occluded by another surface

See individual commits for more details.

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