[arxanas]

My project https://github.com/arxanas/git-branchless does this. Use `git undo -i` to get a graphical view of where branches were at an arbitrary previous point in time.

It's worth noting that, in principle, there are cases where the reflog will have never observed a branch move. The reflog we usually look at is that of HEAD; if HEAD did not have the branch checked out when it moved, then that information will be lost. (For example, if you run `git branch -f my-branch abc123`, the branch will be forcibly reassigned without having been checked out.) See https://github.com/arxanas/git-branchless/wiki/Architecture#... for more details.