[gnome-flashback] display-config: add monitors-changed signal to monitor manager

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 2d28afccb76f3f1026c02ac7fe9bbdf15f7c2866
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Jun 11 13:14:02 2016 +0300

    display-config: add monitors-changed signal to monitor manager

 .../libdisplay-config/flashback-monitor-manager.c  |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/gnome-flashback/libdisplay-config/flashback-monitor-manager.c 
b/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
index 687662f..ba71a3f 100644
--- a/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
+++ b/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
@@ -85,6 +85,15 @@ enum
 
 static GParamSpec *object_properties[N_PROPERTIES] = { NULL, };
 
+enum
+{
+  MONITORS_CHANGED,
+
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL] = { 0 };
+
 static gboolean
 calculate_viewport_matrix (FlashbackMonitorManager *manager,
                            MetaOutput              *output,
@@ -1609,6 +1618,9 @@ flashback_monitor_manager_class_init (FlashbackMonitorManagerClass *manager_clas
 
   g_object_class_install_properties (object_class, N_PROPERTIES,
                                      object_properties);
+
+  g_signal_new ("monitors-changed", FLASHBACK_TYPE_MONITOR_MANAGER,
+                G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 0);
 }
 
 static void
@@ -2258,6 +2270,7 @@ flashback_monitor_manager_rebuild_derived (FlashbackMonitorManager *manager)
     }
 
   g_signal_emit_by_name (manager->priv->display_config, "monitors-changed");
+  g_signal_emit (manager, signals[MONITORS_CHANGED], 0);
 
   g_free (old_monitor_infos);
 }