Uploaded avatar changes not applied to history

Created by: zeeZ

In 6.2.1 (from 6-2-stable), after uploading a custom avatar, only new entries in the dashboard/project home and user activity use the new image. Uploading a new avatar with a different file name results in those entries having broken images.

GitLab should update all avatar references, update references where uploaded avatars were used, use a static file name for the user's avatar, or keep old uploads, to prevent broken images.

Here's an example using the default avatar, then changing it, pushing another commit, and changing it again to a different file name:

After clearing cache (bundle exec rake cache:clear RAILS_ENV=production) all avatar changes are properly applied to the activity log.