gnome.mutter43: Apply fixes for GLib 2.76

This is a downstream patch because the code path is gone in mutter 44.
We should give mutter 44 some try once gala supports it.

Fixes elementary/gala#1580

pkgs/desktops/gnome/core/mutter/43/default.nix

@@ -66,6 +66,14 @@ stdenv.mkDerivation (finalAttrs: {
       url = "https://gitlab.gnome.org/GNOME/mutter/-/commit/285a5a4d54ca83b136b787ce5ebf1d774f9499d5.patch";
       sha256 = "/npUE3idMSTVlFptsDpZmGWjZ/d2gqruVlJKq4eF4xU=";
     })
+
+    # GLib 2.76 switches from using its own slice allocator to using the system malloc instead.
+    # This makes dragging window between workspace in multitasking view crashes Pantheon's Gala.
+    # Inspiration https://github.com/mate-desktop/mate-desktop/pull/538
+    # Backtrace https://github.com/elementary/gala/issues/1580
+    # Upstream report https://gitlab.gnome.org/GNOME/mutter/-/issues/2495
+    # The patch will not apply on 44.0+, make sure this is fixed when trying to clean this up.
+    ./glib-2-76-gala-crash.patch
   ];
 
   mesonFlags = [

pkgs/desktops/gnome/core/mutter/43/glib-2-76-gala-crash.patch

@@ -0,0 +1,25 @@
+diff --git a/clutter/clutter/clutter-actor.c b/clutter/clutter/clutter-actor.c
+index d34c8f59f..8835a6a33 100644
+--- a/clutter/clutter/clutter-actor.c
++++ b/clutter/clutter/clutter-actor.c
+@@ -12304,7 +12304,7 @@ clutter_actor_run_actions (ClutterActor       *self,
+                            ClutterEventPhase   phase)
+ {
+   ClutterActorPrivate *priv;
+-  const GList *actions, *l;
++  const GList *actions, *l, *next;
+   gboolean retval = CLUTTER_EVENT_PROPAGATE;
+
+   priv = self->priv;
+@@ -12313,9 +12313,10 @@ clutter_actor_run_actions (ClutterActor       *self,
+
+   actions = _clutter_meta_group_peek_metas (priv->actions);
+
+-  for (l = actions; l; l = l->next)
++  for (l = actions; l; l = next)
+     {
+       ClutterAction *action = l->data;
++      next = l->next;
+       ClutterEventPhase action_phase;
+
+       action_phase = clutter_action_get_phase (action);