[gtk+] quartz: disable system shadows if a GdkWindow shadow is set.

[Christoph Reiter <creiter src gnome org>]

commit 2c329f5b3a9188411e148351fb93d60cfb2f227e
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun Jul 19 20:13:22 2015 +0200

    quartz: disable system shadows if a GdkWindow shadow is set.
    
    The shadow will be drawn in the wrong place in those cases so all we can
    do is disable it. This fixes double shadows drawn around menus, popups
    and tooltips.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=734984

 gdk/quartz/gdkwindow-quartz.c |   20 ++++++++++++++++++--
 gdk/quartz/gdkwindow-quartz.h |    2 ++
 2 files changed, 20 insertions(+), 2 deletions(-)
---
diff --git a/gdk/quartz/gdkwindow-quartz.c b/gdk/quartz/gdkwindow-quartz.c
index 7d6bfe4..ff759d0 100644
--- a/gdk/quartz/gdkwindow-quartz.c
+++ b/gdk/quartz/gdkwindow-quartz.c
@@ -2133,6 +2133,19 @@ window_type_hint_to_hides_on_deactivate (GdkWindowTypeHint hint)
 }
 
 static void
+_gdk_quartz_window_update_has_shadow (GdkWindowImplQuartz *impl)
+{
+    gboolean has_shadow;
+
+    /* In case there is any shadow set we have to turn off the
+     * NSWindow setHasShadow as the system drawn ones wont match our
+     * window boundary anymore */
+    has_shadow = (window_type_hint_to_shadow (impl->type_hint) && !impl->shadow_max);
+
+    [impl->toplevel setHasShadow: has_shadow];
+}
+
+static void
 gdk_quartz_window_set_type_hint (GdkWindow        *window,
                                  GdkWindowTypeHint hint)
 {
@@ -2150,7 +2163,7 @@ gdk_quartz_window_set_type_hint (GdkWindow        *window,
   if (GDK_WINDOW_IS_MAPPED (window))
     return;
 
-  [impl->toplevel setHasShadow: window_type_hint_to_shadow (hint)];
+  _gdk_quartz_window_update_has_shadow (impl);
   [impl->toplevel setLevel: window_type_hint_to_level (hint)];
   [impl->toplevel setHidesOnDeactivate: window_type_hint_to_hides_on_deactivate (hint)];
 }
@@ -2393,7 +2406,8 @@ gdk_quartz_window_set_decorations (GdkWindow       *window,
                                                                   backing:NSBackingStoreBuffered
                                                                     defer:NO
                                                                    screen:screen];
-          [impl->toplevel setHasShadow: window_type_hint_to_shadow (impl->type_hint)];
+          _gdk_quartz_window_update_has_shadow (impl);
+
           [impl->toplevel setLevel: window_type_hint_to_level (impl->type_hint)];
           if (title)
             [impl->toplevel setTitle:title];
@@ -2825,6 +2839,8 @@ gdk_quartz_window_set_shadow_width (GdkWindow *window,
     return;
 
   impl->shadow_top = top;
+  impl->shadow_max = MAX (MAX (left, right), MAX (top, bottom));
+  _gdk_quartz_window_update_has_shadow (impl);
 }
 
 static cairo_region_t *
diff --git a/gdk/quartz/gdkwindow-quartz.h b/gdk/quartz/gdkwindow-quartz.h
index ccd7633..4c8347c 100644
--- a/gdk/quartz/gdkwindow-quartz.h
+++ b/gdk/quartz/gdkwindow-quartz.h
@@ -62,6 +62,8 @@ struct _GdkWindowImplQuartz
   cairo_surface_t *cairo_surface;
 
   gint shadow_top;
+
+  gint shadow_max;
 };
  
 struct _GdkWindowImplQuartzClass