Upstream bug report: https://we.phorge.it/T15236

Steps to replicate the issue

1. Create a Phabricator project.
2. Archive that project.
3. After archiving it, make multiple separate edits to the project (and/or just open the 'edit details' window & click 'save changes' without modifying anything).

What happens?
Every time you edit the project after archiving it, a new "[username] set this project's color to Red" event is generated & appears in the project's history.

What should have happened instead?
As the project's color hasn't changed since the project was archived, these extra project-history events shoudn't be generated.

Other information/Notes
Reproduced on VPS-project-Phabricator; see https://phabricator.wmcloud.org/project/manage/13/.