[gnome-panel] notification-area: stop using deprecated gdk_display_supports_composite

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 06e938f808043a51f3d71ef701e9e48111f73307
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Oct 30 23:04:20 2016 +0200

    notification-area: stop using deprecated gdk_display_supports_composite

 applets/notification_area/na-tray-child.c   |    3 +--
 applets/notification_area/na-tray-manager.c |    2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/applets/notification_area/na-tray-child.c b/applets/notification_area/na-tray-child.c
index 8684d39..00feeea 100644
--- a/applets/notification_area/na-tray-child.c
+++ b/applets/notification_area/na-tray-child.c
@@ -288,8 +288,7 @@ na_tray_child_new (GdkScreen *screen,
   depth = gdk_visual_get_depth (visual);
 
   visual_has_alpha = red_prec + blue_prec + green_prec < depth;
-  child->has_alpha = (visual_has_alpha &&
-                      gdk_display_supports_composite (gdk_screen_get_display (screen)));
+  child->has_alpha = (visual_has_alpha && gdk_screen_is_composited (screen));
 
   child->composited = child->has_alpha;
 
diff --git a/applets/notification_area/na-tray-manager.c b/applets/notification_area/na-tray-manager.c
index 99a863e..755c31f 100644
--- a/applets/notification_area/na-tray-manager.c
+++ b/applets/notification_area/na-tray-manager.c
@@ -626,7 +626,7 @@ na_tray_manager_set_visual_property (NaTrayManager *manager)
                                                       "_NET_SYSTEM_TRAY_VISUAL");
 
   if (gdk_screen_get_rgba_visual (manager->screen) != NULL &&
-      gdk_display_supports_composite (display))
+      gdk_screen_is_composited (manager->screen))
     xvisual = GDK_VISUAL_XVISUAL (gdk_screen_get_rgba_visual (manager->screen));
   else
     {