From 2fd734c349ab00f2f460af97f7c383678407f620 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20M=C3=BCllner?= <fmuellner@gnome.org>
Date: Wed, 16 Jan 2019 01:09:26 +0100
Subject: [PATCH] constraints: Fix titlebars going off the bottom

The "current" rect includes the frame, so in order to keep the
titlebar on screen, window movement must be restricted to at
most (height - titlebar_height) past the work area bottom.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/391
---
 src/core/constraints.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/core/constraints.c b/src/core/constraints.c
index 3b6203d6b..92b146ce3 100644
--- a/src/core/constraints.c
+++ b/src/core/constraints.c
@@ -1570,7 +1570,7 @@ constrain_titlebar_visible (MetaWindow         *window,
       MetaFrameBorders borders;
       meta_frame_calc_borders (window->frame, &borders);
 
-      bottom_amount = info->current.height + borders.visible.bottom;
+      bottom_amount = info->current.height - borders.visible.top;
       vert_amount_onscreen = borders.visible.top;
     }
   else
@@ -1649,7 +1649,7 @@ constrain_partially_onscreen (MetaWindow         *window,
       MetaFrameBorders borders;
       meta_frame_calc_borders (window->frame, &borders);
 
-      bottom_amount = info->current.height + borders.visible.bottom;
+      bottom_amount = info->current.height - borders.visible.top;
       vert_amount_onscreen = borders.visible.top;
     }
   else
-- 
2.20.1