When Arcanist creates a commit message, either via `amend` or `land`, it formats the usernames included in the message as `username` instead of `@username`. It'd be nice if it used the `@username` format instead, so that the usernames were linked when the commit message was shown in Diffusion.
On commit view pages, the page title uses the precomputed "summary" text, but could often fit more text than the precomputed summary size.
- See PHI2069.
Generally, if someone pushes a 3GB commit message, Phabricator probably breaks right now. D21574 introduced a `getCommitMessageForDisplay()` fiction which could handle this some day. The 3GB message shouldn't make it into the database, the full "message" on the `Data` object should be some long prefix with a total byte count, and the UI should handle warnings like "Only the first 256KB of this huge 3GB commit message are shown."