core/core: Remove meta_retheme_all() helper

All it did was get the MetaDisplay and call a function on it.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/854

src/core/core.c

@@ -276,10 +276,3 @@ meta_core_set_screen_cursor (Display *xdisplay,
 
   meta_frame_set_screen_cursor (window->frame, cursor);
 }
-
-void
-meta_retheme_all (void)
-{
-  if (meta_get_display ())
-    meta_display_retheme_all ();
-}

src/core/core.h

@@ -77,6 +77,4 @@ void       meta_core_set_screen_cursor (Display *xdisplay,
                                         Window   frame_on_screen,
                                         MetaCursor cursor);
 
-void meta_retheme_all (void);
-
 #endif

src/core/display-private.h

@@ -337,7 +337,6 @@ const char* meta_event_mode_to_string   (int m);
 const char* meta_event_detail_to_string (int d);
 
 void meta_display_queue_retheme_all_windows (MetaDisplay *display);
-void meta_display_retheme_all (void);
 
 void meta_display_ping_window      (MetaWindow  *window,
                                     guint32      serial);

src/core/display.c

@@ -1969,12 +1969,6 @@ meta_display_queue_retheme_all_windows (MetaDisplay *display)
   g_slist_free (windows);
 }
 
-void
-meta_display_retheme_all (void)
-{
-  meta_display_queue_retheme_all_windows (meta_get_display ());
-}
-
 /*
  * Stores whether syncing is currently enabled.
  */

src/core/main.c

@@ -717,7 +717,7 @@ prefs_changed_callback (MetaPreference pref,
   switch (pref)
     {
     case META_PREF_DRAGGABLE_BORDER_WIDTH:
-      meta_display_retheme_all ();
+      meta_display_queue_retheme_all_windows (meta_get_display ());
       break;
 
     default:

src/ui/frames.c

@@ -336,7 +336,7 @@ meta_frames_style_updated  (GtkWidget *widget)
 
   g_hash_table_foreach (frames->frames, reattach_style_func, NULL);
 
-  meta_retheme_all ();
+  meta_display_queue_retheme_all_windows (meta_get_display ());
 
   GTK_WIDGET_CLASS (meta_frames_parent_class)->style_updated (widget);
 }