get_focusable
Description:
Checks if a listitem has been set to be focusable via [method@Gtk.
ListItem.set_focusable].
Parameters:
| this | a lits item | 
Returns:
| true if the item is focusable | 
Checks if a listitem has been set to be focusable via [method@Gtk.
ListItem.set_focusable].
| this | a lits item | 
| true if the item is focusable |