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window-actor/wayland: Ensure to use allocation for black background check

Robert Mader requested to merge rmader/mutter:issue3024 into main

The surface actors may not have a valid allocation when running the test. The preferred height, which clutter_actor_get_size() returns in that case, can be wrong in certain cases, making us not add the black background when it's actually needed.

Query the allocation instead, even at the expense of additional relayouts.

While on it, sneak it some small cleanups.

Closes #3024 (closed)

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