Follow-up from "protocol: add wl_compositor.error.bad_parent"
The following discussion from !264 (merged) should be addressed:
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@pq started a discussion: (+1 comment) The first commit is good.
FWIW, Weston's test suite already checks that:
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test_subsurface_paradox
: making a surface into its own child produces BAD_SURFACE -
test_subsurface_loop_paradox
: creating a sub-surface loop with three surfaces produces BAD_SURFACE
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The mentioned MR changes the required error code. Weston and its test suite needs to be updated.