Gets the user data of @menu. This function can be used from the UI Process to get user data previously set from the Web Process with webkit_context_menu_set_user_data().
the user data of @menu, or %NULL if @menu doesn't have user data
2.8
See Implementation
Gets the user data of @menu. This function can be used from the UI Process to get user data previously set from the Web Process with webkit_context_menu_set_user_data().