tests: add sub-surface tree destruction permutations

Add a test for varying the object destruction order in a complex
sub-surface tree.

This test attemps to fuzz the destruction of a sub-surface tree to make
sure the server does not crash on any wl_surface or wl_subsurface
destruction sequence.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 file changed