Summary: Fixes T5646. Makes diffusion a much better user experience. Users now see a 404 exception page when they have a bad URI. Previously, they saw a developer-facing raw exception.
Test Plan: played around in diffusion a bunch. most of these changes were fairly mechanical at the end of the day.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T5646
Differential Revision: https://secure.phabricator.com/D11299
Summary: Ref T2231. Crumbs in the Diffusion edit workflow are a bit wonky, with stuff like "rP (master)" which isn't very useful and no link back to the main "Edit" page. Make them consistent across all the screens.
Test Plan: Loaded a bunch of these screens and saw sane crumbs on all of them.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2231
Differential Revision: https://secure.phabricator.com/D7407