Go get you some Auto Layout goodness.
Sure, there are solutions but I feel this should just be built-in.
Interesting, I've never found myself needing a feature like this, but it seems like a plugin could easily satisfy this need
Anima auto layout does this…sort of
Dear Sketch, just fix the union object issues. I want to throw my laptop every time I use one.
You can send a feature request to the Sketch team here: https://www.sketchapp.com/support/contact/
I've sent a few already, though none I've seen implemented just yet.
Alternatively, you could probably create a plugin that does this for you.