Transactions - adding willRenderTimeline to handle tricky cases
Summary: Fixes T6693.
Test Plan:
Made a bunch of comments on a diff with differential, being sure to leave inlines here and there. This reproduced the issue in T6693. With this patch this issue no longer reproduces!
Successfully "showed older changes" in Maniphest too.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6693
Differential Revision: https://secure.phabricator.com/D10931