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gl-renderer: Workaround for opaque region issue
In weston, clients can set an opaque region which defines an area where a black background will be drawn behind a surface. This is a special case for RGBA textures with bad alpha data. Wobbly uses an algorithm to define vertices that makes it difficult to follow this hack. For now, just use the solid shader if the opaque region is the same as the blend region and the normal shader otherwise.
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