Refactor user file attachments URL computation to handle local sites.
Review Request #9470 - Created Jan. 5, 2018 and submitted
The user file attachments resource URL used for uploading images via
drag-and-drop wasn't correct when a local site was present, because we
include the URL as part of the
UserSessionmodel, which makes it work
- Verified that I could now DnD images into a review request within a
- Ran js-tests.