[metacity/gnome-3-20] frames: restore window resize using titlebar

[Alberts Muktupāvels <muktupavels src gnome org>]

commit b00cbe1ace14c274d324a9a1d8904b11f1591b38
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Jun 27 18:34:52 2016 +0300

    frames: restore window resize using titlebar
    
    https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/1596574

 src/ui/frames.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/ui/frames.c b/src/ui/frames.c
index c0749c7..bd5044b 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -2591,7 +2591,7 @@ get_control (MetaFrames *frames,
 
   if (POINT_IN_RECT (x, y, fgeom.title_rect))
     {
-      if (has_vert && y <= TOP_RESIZE_HEIGHT && has_north_resize)
+      if (has_vert && y <= (fgeom.borders.invisible.top + TOP_RESIZE_HEIGHT) && has_north_resize)
         return META_FRAME_CONTROL_RESIZE_N;
       else
         return META_FRAME_CONTROL_TITLE;