When the feed query on project profile pages overheats, contain the damage
The general reproduction case is "view a project where you can't see more than 50 of the 500 most recent feed stories".
- Forced all queries to overheat.
- Viewed a project profile page.
- Before: overheating fatal near top level.
- After: damage contained to feed panel.
Maniphest Tasks: T13349
Differential Revision: https://secure.phabricator.com/D20704