[gtk/wip/chergert/quartz4u] macos: use gdk_surface_get_mapped()

[Christian Hergert <chergert src gnome org>]

commit 95fd5e72a31864bd8dd2ef8f7eafb7c552737a7b
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 19 11:45:51 2020 -0700

    macos: use gdk_surface_get_mapped()

 gdk/macos/gdkmacosdisplay.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gdk/macos/gdkmacosdisplay.c b/gdk/macos/gdkmacosdisplay.c
index b16ce8529c..ca12940d55 100644
--- a/gdk/macos/gdkmacosdisplay.c
+++ b/gdk/macos/gdkmacosdisplay.c
@@ -841,10 +841,11 @@ _gdk_macos_display_get_surface_at_coords (GdkMacosDisplay *self,
 
       g_assert (GDK_IS_MACOS_SURFACE (surface));
 
-      nswindow = _gdk_macos_surface_get_native (GDK_MACOS_SURFACE (surface));
-      if (![nswindow isVisible])
+      if (!gdk_surface_get_mapped (surface))
         continue;
 
+      nswindow = _gdk_macos_surface_get_native (GDK_MACOS_SURFACE (surface));
+
       if (x >= surface->x &&
           y >= surface->y &&
           x <= (surface->x + surface->width) &&