[PATCH 0/2] MR7892: winewayland: Always check the role to determine whether a surface is a toplevel.

[Alexandros Frantzis (＠afrantzis)]

Since the role objects in the wayland_surface struct are part of a union, we
first need to check whether the surface has the right role before checking
the role objects themselves. Otherwise we risk using a subsurface as a toplevel
or vice-versa.

The second commit introduces a helper to deduplicate the toplevel checks.