[gtk/wip/chergert/quartz4u: 110/146] macos: check workarea top in final check for snapping

[Christian Hergert <chergert src gnome org>]

commit d5030247d732b9d2ee433a32b9acd2934c40e56f
Author: Christian Hergert <chergert redhat com>
Date:   Thu May 21 09:46:33 2020 -0700

    macos: check workarea top in final check for snapping
    
    This helps large surfaces (like from widget factory) do not let
    the CSD window fall underneath the top bar.
    
    We don't want them to end up there until we've dragged across
    monitors (which we will have a new geometry for anyway).

 gdk/macos/edgesnapping.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/gdk/macos/edgesnapping.c b/gdk/macos/edgesnapping.c
index e81b29626c..bf9347265a 100644
--- a/gdk/macos/edgesnapping.c
+++ b/gdk/macos/edgesnapping.c
@@ -206,6 +206,12 @@ _edge_snapping_motion (EdgeSnapping   *self,
       new_window.y = pointer_position->y - self->pointer_offset_in_window.y;
     }
 
+  /* And finally make sure we aren't underneath the top bar of the
+   * particular monitor.
+   */
+  if (Y1 (&new_window) < Y1 (&self->workarea))
+    new_window.y = self->workarea.y;
+
   *window = new_window;
 }