[mutter] wayland: prevent resizing of fixed-size window

[Jonas Ådahl <jadahl src gnome org>]

commit 125f0b0351b30115320dd5b6fa18dd3900ea46ea
Author: Christian Rauch <Rauch Christian gmx de>
Date:   Sun Jul 12 01:04:38 2020 +0100

    wayland: prevent resizing of fixed-size window
    
    Clients can set minimum and maximum to identical values to indicate a
    fixed-size window. A compositor can ignore these requests and thus a client
    has to ensure these limits.
    To support clients that do not ensure these size limits by themselves and
    to skip unnecessary function calls, we will prevent resizing requests by
    the client if a fixed-size has been requested.
    
    https://gitlab.gnome.org/GNOME/mutter/-/issues/1331

 src/wayland/meta-wayland-xdg-shell.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/wayland/meta-wayland-xdg-shell.c b/src/wayland/meta-wayland-xdg-shell.c
index f8ed98ec6e..873c8025b6 100644
--- a/src/wayland/meta-wayland-xdg-shell.c
+++ b/src/wayland/meta-wayland-xdg-shell.c
@@ -351,6 +351,9 @@ xdg_toplevel_resize (struct wl_client   *client,
   if (!window)
     return;
 
+  if (!window->has_resize_func)
+    return;
+
   if (!meta_wayland_seat_get_grab_info (seat, surface, serial, TRUE, &x, &y))
     return;