Emitted when a new [property@Gtk.
ListItem:item] has been set on the
listitem and should be bound for use.
After this signal was emitted, the listitem might be shown in a [class@Gtk.ListView] or other list widget.
GtkSignalListItemFactory:unbind] signal is the opposite of this signal and can be used to
undo everything done in this signal.
The ListItem to bind