When a renderer switch happens, it is possible that when the surface state is created, a buffer for the given surface is already available. In that case, run the attach routine so that the pixel contents are properly set. Otherwise, it would only be set when a new attach request is made for that surface. Also, change the drm backend so that it keeps the buffer reference in the weston_surface when running with the pixman renderer. The pixman renderer keeps a reference to it anyway, so it is never released early. This makes the renderer transition seamless, without leaving a black screen as before.dev
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