[metacity/wip/muktupavels/issue-21] window: offset gravity position by invisible borders

[Alberts Muktupāvels <muktupavels src gnome org>]

commit c4a9e1bc29bd4ad28b7e44b8f3408583aa6b3d4f
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Jul 22 15:19:12 2021 +0300

    window: offset gravity position by invisible borders
    
    https://gitlab.gnome.org/GNOME/metacity/-/issues/21

 src/core/window.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index 948687d7..953a9af9 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -4138,9 +4138,22 @@ meta_window_get_gravity_position (MetaWindow  *window,
   else
     {
       if (window->frame == NULL)
-        frame_extents = window->rect;
+        {
+          frame_extents = window->rect;
+        }
       else
-        frame_extents = window->frame->rect;
+        {
+          MetaFrameBorders borders;
+
+          frame_extents = window->frame->rect;
+
+          meta_frame_calc_borders (window->frame, &borders);
+
+          frame_extents.x += borders.invisible.left;
+          frame_extents.y += borders.invisible.top;
+          frame_extents.width -= borders.invisible.left + borders.invisible.right;
+          frame_extents.height -= borders.invisible.top + borders.invisible.bottom;
+        }
     }
 
   x = frame_extents.x;