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Broken wireframes when flushing SHM damages

GL renderer's flush_damage() leaks GL_UNPACK_SKIP_PIXELS and GL_UNPACK_SKIP_ROWS states. When the wireframe texture is created, glTexImage2D() then incorrectly skips pixels if an SHM client pushed buffer updates right before. This breaks wireframe rendering.

Screenshot_from_2024-07-04_16-09-34

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