The type handler is called when a dbusmenu item is created with a matching type as setup in #dbusmenu_client_add_type_handler
Return value: #TRUE if the type has been handled. #FALSE if this function was somehow unable to handle it.
The #DbusmenuMenuitem that was created
The parent of newitem or #NULL if none
newitem
A pointer to the #DbusmenuClient
The type handler is called when a dbusmenu item is created with a matching type as setup in #dbusmenu_client_add_type_handler