Summary: Fixes T9790. This uses a simple renderer, like the inline context renderer, that emphasizes getting a quick glance at small changes and working reasonably on mobile devices.
Test Plan:
- Set `inline` setting to `9999`.
- Created a diff.
- Saw it render reasonably in HTML mail.
- Also tested text mail to make sure I didn't break that.
{F1310137, size=full}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T9790
Differential Revision: https://secure.phabricator.com/D15901
