wayland.pointer_constraints: Remove constraints in the destructor #1568
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I'm pretty sure this works fine as is, but just to be 100% sure that the reference cycle (see #1552) gets broken properly, let's remove the constraint in the destructor rather than on event.
remove_constraint
removes the constraint object fromwlsurface
user data, and as the constraint object contains the surface in its own user data this makes sure that the cycle is broken properly.