[mutter] renderer/native: Clear pending update list before repopulating

[Marge Bot <marge-bot src gnome org>]

commit a0343b0abd430d04bc04efc167a40c3d5d8947f8
Author: Jonas Ådahl <jadahl gmail com>
Date:   Sat Jun 12 21:09:55 2021 +0200

    renderer/native: Clear pending update list before repopulating
    
    Before we did a simple copy, meaning the old list was overriden. Copy
    was too eager, as it meant views without modes to set was waited for,
    resulting in a dead lock. Instead only the relevant views were added to
    the list for view which had pending updates needed. What was missed was
    that the list was never cleared, meaning we just appended the new list
    on top of the old, causing issues.
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1846
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1843
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1844
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1895>

 src/backends/native/meta-renderer-native.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/backends/native/meta-renderer-native.c b/src/backends/native/meta-renderer-native.c
index a84f3025f0..7e4af8fe0c 100644
--- a/src/backends/native/meta-renderer-native.c
+++ b/src/backends/native/meta-renderer-native.c
@@ -831,7 +831,7 @@ meta_renderer_native_queue_modes_reset (MetaRendererNative *renderer_native)
   MetaRenderer *renderer = META_RENDERER (renderer_native);
   GList *l;
 
-  g_list_free (renderer_native->pending_mode_set_views);
+  g_clear_list (&renderer_native->pending_mode_set_views, NULL);
   for (l = meta_renderer_get_views (renderer); l; l = l->next)
     {
       ClutterStageView *stage_view = l->data;