public static void EndEdit(this IEditableObject self)
{
// accept current state, discard old state
var state = self.GetInternalState();
object clone;
if (!state.TryGetValue(SystemFields.Shapshot, out clone))
{
return; // idempotent
}
State.Remove(clone);
state.Remove(SystemFields.Shapshot);
self.SetProperty(SystemFields.IsChanged, false);
}