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