I have created an app with responsive layout. It is good for different aspect ratio in different devices.
In sharepoint webpart, I can resize the webpart if the default size of the app is too small or does not fit to the page.
However, the ratio of drag resize function is locked with designed aspect ratio of the app and I cannot make it fix to the screen as I want. (too long/short for desktop)
It would be better to lock the ratio for someone who turn on Lock aspect ratio in app and unlock for rest of them.
Or add a ratio field/toggle to set/unlock the ratio.