core: Remove META_LAYER_FULLSCREEN

This layer isn't really being used and in fact, it causes
meta_stack_get_default_focus_window() to return a fullscreen window
even if the naturally topmost window in the stack isn't a fullscreen
one.

Note that commit a3bf9b01aa7019798924b618160fcb184e096a3c changed how
we choose the default focus window from the MRU to the topmost in the
stack.

https://bugzilla.gnome.org/show_bug.cgi?id=768221

src/core/stack.c

@@ -273,34 +273,11 @@ meta_stack_update_window_tile_matches (MetaStack     *stack,
   g_list_free (windows);
 }
 
-static gboolean
-is_focused_foreach (MetaWindow *window,
-                    void       *data)
-{
-  if (window->has_focus)
-    {
-      *((gboolean*) data) = TRUE;
-      return FALSE;
-    }
-  return TRUE;
-}
-
-static gboolean
-windows_on_different_monitor (MetaWindow *a,
-                              MetaWindow *b)
-{
-  if (a->screen != b->screen)
-    return TRUE;
-
-  return a->monitor != b->monitor;
-}
-
 /* Get layer ignoring any transient or group relationships */
 static MetaStackLayer
 get_standalone_layer (MetaWindow *window)
 {
   MetaStackLayer layer;
-  gboolean focused_transient = FALSE;
 
   switch (window->type)
     {
@@ -325,20 +302,8 @@ get_standalone_layer (MetaWindow *window)
       layer = META_LAYER_OVERRIDE_REDIRECT;
       break;
     default:
-      meta_window_foreach_transient (window,
-                                     is_focused_foreach,
-                                     &focused_transient);
-
       if (window->wm_state_below)
         layer = META_LAYER_BOTTOM;
-      else if (window->fullscreen &&
-               (focused_transient ||
-                window == window->display->focus_window ||
-                window->display->focus_window == NULL ||
-                (window->display->focus_window != NULL &&
-                 windows_on_different_monitor (window,
-                                               window->display->focus_window))))
-        layer = META_LAYER_FULLSCREEN;
       else if (window->wm_state_above && !META_WINDOW_MAXIMIZED (window))
         layer = META_LAYER_TOP;
       else
@@ -393,8 +358,6 @@ get_maximum_layer_in_group (MetaWindow *window)
 static void
 compute_layer (MetaWindow *window)
 {
-  MetaStackLayer old_layer = window->layer;
-
   window->layer = get_standalone_layer (window);
 
   /* We can only do promotion-due-to-group for dialogs and other
@@ -429,10 +392,6 @@ compute_layer (MetaWindow *window)
   meta_topic (META_DEBUG_STACK, "Window %s on layer %u type = %u has_focus = %d\n",
               window->desc, window->layer,
               window->type, window->has_focus);
-
-  if (window->layer != old_layer &&
-      (old_layer == META_LAYER_FULLSCREEN || window->layer == META_LAYER_FULLSCREEN))
-    meta_screen_queue_check_fullscreen (window->screen);
 }
 
 /* Front of the layer list is the topmost window,
@@ -990,6 +949,8 @@ stack_do_resort (MetaStack *stack)
   stack->sorted = g_list_sort (stack->sorted,
                                (GCompareFunc) compare_window_position);
 
+  meta_screen_queue_check_fullscreen (stack->screen);
+
   stack->need_resort = FALSE;
 }
 

src/core/window.c

@@ -3180,7 +3180,6 @@ meta_window_make_fullscreen_internal (MetaWindow  *window)
       window->fullscreen = TRUE;
 
       meta_stack_freeze (window->screen->stack);
-      meta_window_update_layer (window);
 
       meta_window_raise (window);
       meta_stack_thaw (window->screen->stack);
@@ -3265,7 +3264,7 @@ meta_window_unmake_fullscreen (MetaWindow  *window)
                                           window, META_SIZE_CHANGE_UNFULLSCREEN,
                                           &old_frame_rect, &old_buffer_rect);
 
-      meta_window_update_layer (window);
+      meta_screen_queue_check_fullscreen (window->screen);
 
       g_object_notify_by_pspec (G_OBJECT (window), obj_props[PROP_FULLSCREEN]);
     }

src/meta/common.h

@@ -519,7 +519,6 @@ void meta_frame_borders_clear (MetaFrameBorders *self);
  * @META_LAYER_NORMAL: Normal layer
  * @META_LAYER_TOP: Top layer
  * @META_LAYER_DOCK: Dock layer
- * @META_LAYER_FULLSCREEN: Fullscreen layer
  * @META_LAYER_OVERRIDE_REDIRECT: Override-redirect layer
  * @META_LAYER_LAST: Marks the end of the #MetaStackLayer enumeration
  *
@@ -533,7 +532,6 @@ typedef enum
   META_LAYER_NORMAL	       = 2,
   META_LAYER_TOP	       = 4, /* Same as DOCK; see EWMH and bug 330717 */
   META_LAYER_DOCK	       = 4,
-  META_LAYER_FULLSCREEN	       = 5,
   META_LAYER_OVERRIDE_REDIRECT = 7,
   META_LAYER_LAST	       = 8
 } MetaStackLayer;