dbus/dbusmenu: connect onItemPropertiesUpdated

Evidently this was broken at some point or never connected.

changelog/next.md

@@ -78,6 +78,7 @@ set shell id.
 - Fixed screencopy crashing when used across GPUs.
 - Fixed pipewire volumes not working for some pw-pulse clients.
 - Fixed nulls in Toplevel.screens after unplugging a monitor.
+- Fixed some DbusMenu updates being dropped from apps.
 
 ## Packaging Changes
 

src/dbus/dbusmenu/dbusmenu.cpp

@@ -301,6 +301,13 @@ DBusMenu::DBusMenu(const QString& service, const QString& path, QObject* parent)
 	    &DBusMenu::onLayoutUpdated
 	);
 
+	QObject::connect(
+	    this->interface,
+	    &DBusMenuInterface::ItemsPropertiesUpdated,
+	    this,
+	    &DBusMenu::onItemPropertiesUpdated
+	);
+
 	this->properties.setInterface(this->interface);
 	this->properties.updateAllViaGetAll();
 }