Bad diff

[danvk]

When I run webdiff https://github.com/danvk/webdiff/pull/81/files and look at webdiff/static/js/components.jsx, there are a few issues:

1. The Root class (lines 5–90 on the right side) has a confusing diff. There are lots of identical before/after lines, but they're not rendered next to one another.
2. Syntax highlighting seems to get confused by the jsx.