object-manager: add _is_installed() method to query installation status

lib/wp/object-manager.c

@@ -207,6 +207,20 @@ wp_object_manager_new (void)
   return g_object_new (WP_TYPE_OBJECT_MANAGER, NULL);
 }
 
+/**
+ * wp_object_manager_is_installed:
+ * @self: the object manager
+ *
+ * Returns: %TRUE if the object manager is installed (the
+ *   WpObjectManager::installed has been emitted), %FALSE otherwise
+ */
+gboolean
+wp_object_manager_is_installed (WpObjectManager * self)
+{
+  g_return_val_if_fail (WP_IS_OBJECT_MANAGER (self), FALSE);
+  return self->installed;
+}
+
 /**
  * wp_object_manager_add_interest:
  * @self: the object manager

lib/wp/object-manager.h

@@ -45,6 +45,13 @@ G_DECLARE_FINAL_TYPE (WpObjectManager, wp_object_manager, WP, OBJECT_MANAGER, GO
 WP_API
 WpObjectManager * wp_object_manager_new (void);
 
+/* installation */
+
+WP_API
+gboolean wp_object_manager_is_installed (WpObjectManager * self);
+
+/* interest */
+
 WP_API G_DEPRECATED
 void wp_object_manager_add_interest (WpObjectManager *self,
     GType gtype, GVariant * constraints, WpProxyFeatures wanted_features);
@@ -57,10 +64,14 @@ WP_API
 void wp_object_manager_add_interest_full (WpObjectManager * self,
     WpObjectInterest * interest);
 
+/* proxy features */
+
 WP_API
 void wp_object_manager_request_proxy_features (WpObjectManager *self,
     GType proxy_type, WpProxyFeatures wanted_features);
 
+/* object inspection */
+
 WP_API
 guint wp_object_manager_get_n_objects (WpObjectManager * self);