manager: get all connected sources

Added ::get_sources_connected API to retrieve a list of every source the
application has connected, no matter whether they are enabled or not.
Use ::get_sources_connected on calendars menu in GcalWindow to enable
disabled sources.

src/gcal-manager.c

@@ -635,8 +635,7 @@ gcal_manager_new_with_settings (GSettings *settings)
  *
  * Retrieve a list of the enabled sources used in the application.
  *
- * Returns: (Transfer full) a {@link GList} object
+ * Returns: (Transfer full) a {@link GList} object to be freed with g_list_free()
- * to be freed with g_list_free()
  **/
 GList*
 gcal_manager_get_sources (GcalManager *manager)
@@ -659,6 +658,23 @@ gcal_manager_get_sources (GcalManager *manager)
   return aux;
 }
 
+/**
+ * gcal_manager_get_sources_connected:
+ * @manager:
+ *
+ * Returns a {@link GList} with every source connected on the app, whether they are enabled or not.
+ *
+ * Returns: (Transfer full) a {@link GList} object to be freed with g_list_free()
+ **/
+GList*
+gcal_manager_get_sources_connected (GcalManager *manager)
+{
+  GcalManagerPrivate *priv;
+
+  priv = gcal_manager_get_instance_private (manager);
+  return g_hash_table_get_keys (priv->clients);
+}
+
 /**
  * gcal_manager_get_default_source:
  * @manager: App singleton {@link GcalManager} instance

src/gcal-manager.h

@@ -63,6 +63,8 @@ GcalManager*   gcal_manager_new_with_settings       (GSettings          *setting
 
 GList*         gcal_manager_get_sources             (GcalManager        *manager);
 
+GList*         gcal_manager_get_sources_connected   (GcalManager        *manager);
+
 ESource*       gcal_manager_get_default_source      (GcalManager        *manager);
 
 icaltimezone*  gcal_manager_get_system_timezone     (GcalManager        *manager);

src/gcal-window.c

@@ -776,7 +776,7 @@ on_calendar_toggled (GSimpleAction *action,
 
   /* lookup source */
   source = NULL;
-  l = gcal_manager_get_sources (priv->manager);
+  l = gcal_manager_get_sources_connected (priv->manager);
 
   for (aux = l; aux != NULL; aux = aux->next)
     {