Tests that glCopyImageSubData correctly copies all levels of a texture.
Also tests that the order in which levels are initialized doesn't affect
the copying (some drivers, e.g. gallium drivers, may be sensitive to the
initialization order).
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Tests that glCopyImageSubData correctly copies all levels of a texture.
Also tests that the order in which levels are initialized doesn't affect
the copying (some drivers, e.g. gallium drivers, may be sensitive to the
initialization order).