GtkSnapshotsave

Makes a copy of the current state of snapshot and saves it on an internal stack.

When 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().