Scaler: keep aspect ratio when scaling

<p>When scaling, keeping aspect ratio is important!</p><p><br></p><p>For example, lock the aspect ratio of inner layer when scaling its outer layer.</p><p><br></p><p>It's easy to use!</p><ol><li>Add your layers to lock</li><li>Just scale as usual</li></ol><p><br></p><p><br></p><p>Any questions or suggestions, contact me: [email protected]</p>