Shorten revision ID for git events
Using the full SHA1 hash in the activity tab is really annoying. They take up a tremendous amount of screen space, for no added value, as 7-8 characters from the hash is enough to ID a revision in most projects.
Attached is a patch that achieves the shortening effect, in the same way that the repository file browser does (basically truncating to the first 8 characters from the revision id).
Ideally this should be done by asking Git for what it thinks the short id is for each revision, as it is aware of how many bits are needed to ensure unique-ness. But I have no idea how to do that, as I am new to Ruby.