Include the file and interdiff information in diff fragment ETags.
Review Request #7273 — Created May 1, 2015 and submitted
The diff fragments were only considering diff revision numbers (by way of the URL) for the ETag, and not the IDs of the objects in the database. This resulted in stale caches if trying to upload another draft of a diff with the same revision. We now include both the filediff ID and the interdiffset ID (if any).
Manually tested, and saw that subsequent uploads of a diff were rendering without
having to clear cache.Unit tests pass.