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wayland/subsurface: Hold sibling surface reference in placement ops

Michel Dänzer requested to merge daenzer/mutter:wayland-subsurface-placement-op-sibiling-ref into main

It was possible for the sibling surface to be already destroyed in meta_wayland_transaction_add_placement_surfaces, in which case g_object_ref would return NULL for it, and meta_wayland_transaction_commit would then crash dereferencing a NULL surface pointer.

Closes: #3462 (closed)

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