Hi. Its easier to demonstrate than to explain: https://www.screencast.com/t/IhWrGNwt
As you can see, when I move right edge of the window, left edge stays firmly in place as it should. But when I move the left edge - the right edge shakes a lot. Native windows do not shake like that. I mean I expect content to shake due to stretching/resizing, thats ok. But it would be nice if window's border did not move on its own in the process.
I guess this is not a major issue by any means, but it does not look pretty.