[mutter] keybindings: Limit corner move to current monitor

[Jonas Ådahl <jadahl src gnome org>]

commit 6c5baf89ede6ea4e52724194003aae4f70427677
Author: Jānis Džeriņš <smuglispweenie gmail com>
Date:   Tue Sep 25 20:59:43 2018 +0300

    keybindings: Limit corner move to current monitor
    
    Moving windows using `move-to-side-X` and `move-corner-XX` keybindings
    should keep windows within the confines of current screen.
    
    `move-to-monitor-XXX` keybindings can be used to move windows to other
    monitors.
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/issues/320

 src/core/keybindings.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index 968754938..3830492a9 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -2839,7 +2839,10 @@ handle_move_to_corner_backend (MetaDisplay           *display,
   MetaRectangle frame_rect;
   int new_x, new_y;
 
-  meta_window_get_work_area_all_monitors (window, &work_area);
+  if (!window->monitor)
+    return;
+
+  meta_window_get_work_area_current_monitor (window, &work_area);
   meta_window_get_frame_rect (window, &frame_rect);
 
   switch (gravity)