Switch from storing both the ref and the commit to storing just one or the other as a refish.
Change action methods that receive PBRefMenuItem to support the change in functionality. In particular the removeRefSheetDidEnd:returnCode:contextInfo: method in PBRefController now looks up the commit for the ref (this was the only place that needed both the ref and the commit).
That's why it's there, after all. This also makes the system
more robust and catches some more errors.
The next thing this enables is to also allow right-clicking
on refs in the commit list.
Nathan Kinsinger