Line number gutter resizes automatically. If it's not properly adjusting under your configuration and if you're not wanting to check out the latest builds, then I suppose you could ask or wait for others to comment.
As part of supporting display scaling and high-res monitors, many bits of the user interface have gotten updates. There are hundreds of internal builds between releases. Some of those are posted to TreeHouse/test branch to help review changes under various configurations. I understand that not everyone can try TreeHouse builds but that's the best way to give feedback on the way to a general release.