Review and consolidate existing logic for managing autosize.js

Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.

• Close this issue

There's quite a lot of JavaScript that manages autosize.js, much of it isn't DRY, much may not actually be used, and very little of which is under test. It would make sense to create a simple service that consolidates the logic and allows different implementors to make use of as needed. Autosize.js already introduces a serious performance bottleneck -- it's possible that we're making it worse than it needs to be.