[mutter/wip/carlosg/xwayland-on-demand: 7/18] x11: Do not queue stack operation for guard window

[Carlos Garnacho <carlosg src gnome org>]

commit 19b739e9d3377d1186c8e8383facb01b31ed1711
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri May 24 23:27:40 2019 +0200

    x11: Do not queue stack operation for guard window
    
    In the case mutter is a x11 compositor, it doesn't matter much
    since the stack tracker will go away soon. In the case this is a
    wayland compositor with mandatory Xwayland, it matters even less
    since the session would be shutting down in those paths.
    
    But if this a wayland compositor that can start Xwayland on demand,
    this is even harmful, as the MetaStackTracker should be cleared of
    x11 windows at this moment, and we actually did right before dispose
    on ::x11-display-closing.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/709

 src/x11/meta-x11-display.c | 13 -------------
 1 file changed, 13 deletions(-)
---
diff --git a/src/x11/meta-x11-display.c b/src/x11/meta-x11-display.c
index def878d2c..6f20797e6 100644
--- a/src/x11/meta-x11-display.c
+++ b/src/x11/meta-x11-display.c
@@ -182,21 +182,8 @@ meta_x11_display_dispose (GObject *object)
 
   if (x11_display->guard_window != None)
     {
-      MetaStackTracker *stack_tracker = x11_display->display->stack_tracker;
-
-      if (stack_tracker)
-        {
-          unsigned long serial;
-
-          serial = XNextRequest (x11_display->xdisplay);
-          meta_stack_tracker_record_remove (stack_tracker,
-                                            x11_display->guard_window,
-                                            serial);
-        }
-
       XUnmapWindow (x11_display->xdisplay, x11_display->guard_window);
       XDestroyWindow (x11_display->xdisplay, x11_display->guard_window);
-
       x11_display->guard_window = None;
     }