Add meta_window_is_override_redirect

Trivial function, useful for plugins which are doing analysis
of windows.

src/compositor/mutter-window.c

@@ -701,10 +701,7 @@ mutter_window_get_window_type (MutterWindow *self)
 gboolean
 mutter_window_is_override_redirect (MutterWindow *self)
 {
-  if (self->priv->window->override_redirect)
-    return TRUE;
-
-  return FALSE;
+  return meta_window_is_override_redirect (self->priv->window);
 }
 
 const char *mutter_window_get_description (MutterWindow *self)

src/core/window.c

@@ -8579,6 +8579,20 @@ meta_window_is_shaded (MetaWindow *window)
   return window->shaded;
 }
 
+/**
+ * meta_window_is_override_redirect:
+ * @window: A #MetaWindow
+ *
+ * Returns if this window isn't managed by mutter; it will
+ * control its own positioning and mutter won't draw decorations
+ * among other things.  In X terminology this is "override redirect".
+ */
+gboolean
+meta_window_is_override_redirect (MetaWindow *window)
+{
+  return window->override_redirect;
+}
+
 MetaRectangle *
 meta_window_get_rect (MetaWindow *window)
 {

src/include/window.h

@@ -70,6 +70,7 @@ GType meta_window_get_type (void);
 MetaFrame *meta_window_get_frame (MetaWindow *window);
 gboolean meta_window_has_focus (MetaWindow *window);
 gboolean meta_window_is_shaded (MetaWindow *window);
+gboolean meta_window_is_override_redirect (MetaWindow *window);
 MetaRectangle *meta_window_get_rect (MetaWindow *window);
 void meta_window_get_outer_rect (const MetaWindow *window, MetaRectangle *rect);
 MetaScreen *meta_window_get_screen (MetaWindow *window);