It’s nice to see that Acorn isn’t the only app with this bug. Notice the baseline of the text (and box) in Keynote as it is resized from the top. It shakes, which is caused by the canvas not being viewed at 100% scale, which in turn causes rounding problems somewhere along the chain.

Acorn has had versions of this problem for years, and it always drives me a little crazy when I see it. But this is Apple's Keynote, so I get to laugh this time.