Discard SurfaceItemXwayland's quads when shape changes
The SurfaceItemXwayland has to re-build quads if the shape changes.
The SurfaceItemX11 doesn't need a similar fix as it already discards quads whenever the shape region changes.
The SurfaceItemXwayland has to re-build quads if the shape changes.
The SurfaceItemX11 doesn't need a similar fix as it already discards quads whenever the shape region changes.