mir: Implement the GdkDisplay get_setting vfunc

Just call the corresponding screen vfunc.

gdk/mir/gdkmir-private.h

@@ -138,4 +138,10 @@ EGLSurface _gdk_mir_window_get_dummy_egl_surface (GdkWindow *window, EGLConfig c
 
 void _gdk_mir_print_event (const MirEvent *event);
 
+gboolean gdk_mir_screen_get_setting (GdkScreen   *screen,
+                                     const gchar *name,
+                                     GValue      *value);
+
+
+
 #endif /* __GDK_PRIVATE_MIR_H__ */

gdk/mir/gdkmirdisplay.c

@@ -1178,6 +1178,14 @@ gdk_mir_display_get_monitor (GdkDisplay *display,
   return g_list_nth_data (GDK_MIR_DISPLAY (display)->monitors, index);
 }
 
+static gboolean
+gdk_mir_display_get_setting (GdkDisplay *display,
+                             const char *name,
+                             GValue     *value)
+{
+  return gdk_mir_screen_get_setting (GDK_MIR_DISPLAY (display)->screen, name, value);
+}
+
 static void
 gdk_mir_display_init (GdkMirDisplay *display)
 {
@@ -1235,4 +1243,5 @@ gdk_mir_display_class_init (GdkMirDisplayClass *klass)
   display_class->make_gl_context_current = gdk_mir_display_make_gl_context_current;
   display_class->get_n_monitors = gdk_mir_display_get_n_monitors;
   display_class->get_monitor = gdk_mir_display_get_monitor;
+  display_class->get_setting = gdk_mir_display_get_setting;
 }

gdk/mir/gdkmirscreen.c

@@ -662,7 +662,7 @@ static const gchar * const KNOWN_SETTINGS[] =
   NULL
 };
 
-static gboolean
+gboolean
 gdk_mir_screen_get_setting (GdkScreen   *screen,
                             const gchar *name,
                             GValue      *value)