The ::insert signal is emitted when a new
GtkMenuItem is added to
GtkMenuShell. A separate signal is used instead of
GtkContainer::add because of the need for an additional position parameter.
The inverse of this signal is the GtkContainer::removed signal.
The default handler is called before the handlers added via
|Available since: 3.2
GtkMenuItemthat is being inserted.
The data is owned by the caller of the function.
The position at which the insert occurs.