[gtk/wip/chergert/quartz4u] macos: fix workarea calculation

[Christian Hergert <chergert src gnome org>]

commit 5be873e8429fb196f8b362eebb8e912ca33e5bf9
Author: Christian Hergert <chergert redhat com>
Date:   Fri May 8 14:04:42 2020 -0700

    macos: fix workarea calculation

 gdk/macos/gdkmacosmonitor.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)
---
diff --git a/gdk/macos/gdkmacosmonitor.c b/gdk/macos/gdkmacosmonitor.c
index 80cd56d484..4bb3c195c2 100644
--- a/gdk/macos/gdkmacosmonitor.c
+++ b/gdk/macos/gdkmacosmonitor.c
@@ -63,13 +63,11 @@ gdk_macos_monitor_get_workarea (GdkMonitor   *monitor,
         {
           NSScreen *screen = (NSScreen *)obj;
           NSRect visibleFrame = [screen visibleFrame];
-          int x;
-          int y;
+          int x = visibleFrame.origin.x;
+          int y = visibleFrame.origin.y + visibleFrame.size.height;
 
           _gdk_macos_display_from_display_coords (GDK_MACOS_DISPLAY (monitor->display),
-                                                  visibleFrame.origin.x,
-                                                  visibleFrame.origin.y,
-                                                  &x, &y);
+                                                  x, y, &x, &y);
 
           geometry->x = x;
           geometry->y = y;