[metacity] frames: ignore event outside of frame in get_control

[Alberts Muktupāvels <muktupavels src gnome org>]

commit c9fadf774e2f42d8f1036912be12dc2cdb9dad37
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue May 24 14:00:56 2016 +0300

    frames: ignore event outside of frame in get_control
    
    https://bugzilla.gnome.org/show_bug.cgi?id=436416

 src/ui/frames.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/ui/frames.c b/src/ui/frames.c
index be51bf5..644fa51 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -2756,6 +2756,9 @@ get_control (MetaFrames *frames,
   meta_frames_calc_geometry (frames, frame, &fgeom);
   get_client_rect (&fgeom, fgeom.width, fgeom.height, &client);
 
+  if (x < 0 || y < 0 || x > fgeom.width || y > fgeom.height)
+    return META_FRAME_CONTROL_NONE;
+
   if (POINT_IN_RECT (x, y, client))
     return META_FRAME_CONTROL_CLIENT_AREA;