Commit 6dcf73ad authored by David Edmundson's avatar David Edmundson
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Guard subsurface parent access.

Whilst a subsurface must have a parent at the time of creation, the
lifespan is not guaranteed afterwards.

It's a weird thing for a client to do, but we need to not crash

If the parent surface is destroyed we should consider the surface

BUG: 452044

(cherry picked from commit 1d2424a5)
parent 97df88c6
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