[mutter/gnome-3-34] plugin-manager: Kill window effects on destroy

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 403d8fcc6624f5d027dd599c934411e71d248754
Author: Robert Mader <robert mader posteo de>
Date:   Fri Nov 8 17:27:28 2019 +0000

    plugin-manager: Kill window effects on destroy
    
    We do so for all other window effects already. Why this was left out
    is unknown (9b3a0d1ad8f), but we will need it for a fix in GS.
    
    Related: https://gitlab.gnome.org/GNOME/mutter/issues/655
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/924
    
    
    (cherry picked from commit a4f51da184e8eab0a2d44d0fc535032515436e8d)

 src/compositor/meta-plugin-manager.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/compositor/meta-plugin-manager.c b/src/compositor/meta-plugin-manager.c
index 09bcfd333..47bf922db 100644
--- a/src/compositor/meta-plugin-manager.c
+++ b/src/compositor/meta-plugin-manager.c
@@ -195,6 +195,8 @@ meta_plugin_manager_event_simple (MetaPluginManager *plugin_mgr,
       if (klass->destroy)
         {
           retval = TRUE;
+          meta_plugin_manager_kill_window_effects (plugin_mgr,
+                                                   actor);
           klass->destroy (plugin, actor);
         }
       break;