[gtk/wip/matthiasc/context-menu] fix property notification

[Matthias Clasen <matthiasc src gnome org>]

commit 140e1acb0635c6f5ef923d1703453ffd2bde496f
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jun 12 00:45:05 2019 +0000

    fix property notification

 gtk/gtkwidget.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 62f9fd5865..ccd25317f7 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -1444,7 +1444,7 @@ gtk_widget_class_init (GtkWidgetClass *klass)
                             P_("Handle Context Menu"),
                             P_("Whether the context menu should be handled automatically"),
                             TRUE,
-                            GTK_PARAM_READWRITE);
+                            GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   g_object_class_install_properties (gobject_class, NUM_PROPERTIES, widget_props);
 
@@ -2389,7 +2389,11 @@ gtk_widget_set_property (GObject         *object,
       gtk_widget_set_context_menu (widget, g_value_get_object (value));
       break;
     case PROP_HANDLE_CONTEXT_MENU:
-      priv->handle_context_menu = g_value_get_boolean (value);
+      if (priv->handle_context_menu != g_value_get_boolean (value))
+        {
+          priv->handle_context_menu = g_value_get_boolean (value);
+          g_object_notify_by_pspec (object, pspec);
+        }
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);