[mutter] window: Initialize saved_rect_fullscreen too

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

commit 13f35ab0640631566f52c80583b09fe4e3dc3685
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Jan 7 16:30:19 2022 +0100

    window: Initialize saved_rect_fullscreen too
    
    We save the window rect before going fullscreen to a dedicated variable,
    so we can go back to the correct dimension. We also have a dedicated
    variable for returning from other window states, e.g. maximized, and
    this one we initialized when creating the MetaWindow. This meant that we
    could always rely on this being up to date on X11 windows that were
    mapped maximized or fullscreen.
    
    What the commit that introduced the saved rect dedicated for going
    unfullscreen missed was to initialize the new saved rectangle too when
    creating the MetaWindow. This resulted in windows mapped as fullscreen
    often ending up misbehaving when unfullscreening, as mutter would tell
    them to unfullscreen to 0x0.
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1786
    Fixes: a51ad8f932cb55bdd8a62fc5d8d10af7fc62b0a0
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2210>

 src/core/window.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/core/window.c b/src/core/window.c
index 518cebb347..1c65e7ab88 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -1061,6 +1061,7 @@ _meta_window_shared_new (MetaDisplay         *display,
 
   /* And this is our unmaximized size */
   window->saved_rect = window->rect;
+  window->saved_rect_fullscreen = window->rect;
   window->unconstrained_rect = window->rect;
 
   window->depth = attrs->depth;