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Use cursor plane also with Pixman-renderer on DRM-backend

Currently the DRM-backend depends on GBM for cursor planes, more specifically for the buffers for cursor planes. This means that cursor planes can be used only if GBM is initialized, which means using GL-renderer. Hence when using Pixman-renderer, cursor plane is not used.

It might be nice to be able to use the cursor plane also with Pixman-renderer. Repainting for only cursor motion with Pixman has a cost that could be avoided.

Should there be an alternative path to GBM, or should the GBM path be replaced completely?

Why did we use GBM for cursor buffers?

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