[PATCH 0/1] MR7690: winewayland: Don't use a destroyed surface in text input.

[Attila Fidan (＠atticf)]

Don't assert or get the user data of null surface arguments. When the
callbacks are run with a null surface it means the surface was destroyed
client-side but the compositor has yet to process the destroy request
and has sent events referencing the surface which no longer exists on
the client.

The wl_surface pointer also needs to be removed during
wayland_surface_destroy to prevent it from becoming a dangling pointer
which may be used if text_input_done or text_input_leave is run after
the surface is destroyed. While doing so, track the hwnd instead to be
consistent with keyboard and pointer.