Summary: Fixes T7757. Since anchor links can't be processed server side, we have to detect the message is old in javascript, then re-loaded the page. This opens up a new corner case where we have to paginate in newer messages, so this also adds support for that.
Test Plan:
- set main query limit to 8 and then visited ZXX#YYY. noted a second quick load of YYY, that YYY ended up highlighted and scrolled to.
- used "show newer messages" and "show older messages" successfully, taking care to make sure transaction ids were all correct with no off by one errors, etc.
- opened and closed durable column to make sure that still works too
Reviewers: chad, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T7757
Differential Revision: https://secure.phabricator.com/D12633
b199f7066c