sortAs is completely broken

[raxod502]

TLDR JavaScript is dumb.

Currently we handle sorting in the sidebar by passing a sortAs function to createTwoLevelViewJSX. The function returns an array, because any reasonable programming language would let you use an array as a sort key, and compare lexicographically. Unfortunately, it turns out that JavaScript just converts both arrays to strings and then compares those. This is obviously completely broken and it's a total fluke that it doesn't break any noticeable use case in the app. Unfortunately, it's incredibly inconvenient to thread the sort logic all the way through the stack, which is what you have to do to work around this. But it needs to be fixed.