Restore some global signals.

These were part of MetaScreen, and are part of CinnamonScreen now,
but we want to move away from using that, so add these signals
back to MetaDisplay (where most of MetaScreen's functions went
already).

Author: mtwebster

src/core/display.c

@@ -149,6 +149,9 @@ enum
   PAD_MODE_SWITCH,
   WINDOW_ENTERED_MONITOR,
   WINDOW_LEFT_MONITOR,
+  WINDOW_MONITOR_CHANGED,
+  WINDOW_WORKSPACE_CHANGED,
+  WINDOW_SKIP_TASKBAR_CHANGED,
   WORKSPACE_ADDED,
   WORKSPACE_REMOVED,
   WORKSPACE_SWITCHED,
@@ -470,6 +473,35 @@ meta_display_class_init (MetaDisplayClass *klass)
                   G_TYPE_INT,
                   META_TYPE_WINDOW);
 
+  display_signals[WINDOW_MONITOR_CHANGED] =
+    g_signal_new ("window-monitor-changed",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 2,
+                  META_TYPE_WINDOW,
+                  G_TYPE_INT);
+
+  display_signals[WINDOW_WORKSPACE_CHANGED] =
+    g_signal_new ("window-workspace-changed",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 2,
+                  META_TYPE_WINDOW,
+                  META_TYPE_WORKSPACE);
+
+  display_signals[WINDOW_SKIP_TASKBAR_CHANGED] =
+    g_signal_new ("window-skip-taskbar-changed",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 1,
+                  META_TYPE_WINDOW);
+
   display_signals[IN_FULLSCREEN_CHANGED] =
     g_signal_new ("in-fullscreen-changed",
                   G_TYPE_FROM_CLASS (klass),

src/core/window.c

@@ -1005,8 +1005,13 @@ meta_window_main_monitor_changed (MetaWindow               *window,
     g_signal_emit_by_name (window->display, "window-left-monitor",
                            old->number, window);
   if (window->monitor)
-    g_signal_emit_by_name (window->display, "window-entered-monitor",
-                           window->monitor->number, window);
+    {
+      g_signal_emit_by_name (window->display, "window-entered-monitor",
+                             window->monitor->number, window);
+
+      g_signal_emit_by_name (window->display, "window-monitor-changed",
+                             window, window->monitor->number);
+    }
 }
 
 MetaLogicalMonitor *
@@ -5320,6 +5325,7 @@ set_workspace_state (MetaWindow    *window,
   meta_window_current_workspace_changed (window);
   g_object_notify_by_pspec (G_OBJECT (window), obj_props[PROP_ON_ALL_WORKSPACES]);
   g_signal_emit (window, window_signals[WORKSPACE_CHANGED], 0);
+  g_signal_emit_by_name (window->display, "window-workspace-changed", window, window->workspace);
 }
 
 static gboolean
@@ -6238,7 +6244,10 @@ meta_window_recalc_features (MetaWindow *window)
               window->skip_pager);
 
   if (old_skip_taskbar != window->skip_taskbar)
-    g_object_notify_by_pspec (G_OBJECT (window), obj_props[PROP_SKIP_TASKBAR]);
+    {
+      g_object_notify_by_pspec (G_OBJECT (window), obj_props[PROP_SKIP_TASKBAR]);
+      g_signal_emit_by_name (window->display, "window-skip-taskbar-changed", window);
+    }
 
   /* FIXME:
    * Lame workaround for recalc_features being used overzealously.