Snapshot.save
void save()Makes a copy of the current state of snapshot and saves it on an internal stack.
When [gtk.snapshot.Snapshot.restore] is called, snapshot will be restored to the saved state.
Multiple calls to [gtk.snapshot.Snapshot.save] and [gtk.snapshot.Snapshot.restore] can be nested; each call to [gtk.snapshot.Snapshot.restore] restores the state from the matching paired [gtk.snapshot.Snapshot.save].
It is necessary to clear all saved states with corresponding calls to [gtk.snapshot.Snapshot.restore].