[gtk+] use the GdkDisplay get_setting vfunc

[Matthias Clasen <matthiasc src gnome org>]

commit f9dacd6de0f45ce531d0e0ef770b8cbd5e648c06
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 30 16:44:47 2017 -0400

    use the GdkDisplay get_setting vfunc
    
    Instead of calling the GdkScreen implementation, use our
    own vfunc now.

 gdk/gdkdisplay.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkdisplay.c b/gdk/gdkdisplay.c
index f8989c6..febd9ab 100644
--- a/gdk/gdkdisplay.c
+++ b/gdk/gdkdisplay.c
@@ -2238,7 +2238,11 @@ gdk_display_get_setting (GdkDisplay *display,
                          const char *name,
                          GValue     *value)
 {
-  return gdk_screen_get_setting (gdk_display_get_default_screen (display), name, value);
+  g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
+  g_return_val_if_fail (name != NULL, FALSE);
+  g_return_val_if_fail (value != NULL, FALSE);
+
+  return GDK_DISPLAY_GET_CLASS (display)->get_setting (display, name, value);
 }
 
 void