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625ea86672
The proprietary nvidia driver garbles GPU memory on suspend. In order to workaround that limitation, this commit copies all textures to host memory on suspend and restores them on resume. One complication comes from external textures (such as those given to us by Xwayland for X clients). We can't just restore those textures, since they aren't writable. This commit addresses that complication by keeping a local texture around for those external textures, and using it instead for parts of the window that haven't been redrawn since resume.