[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.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/7892