On vr, 2016-09-02 at 18:23 +0200, Johannes Schindelin wrote:

This is crucial to improve performance on Windows, as the speed is now
mostly dominated by the SHA-1 transformation (because it spawns a new
rev-parse process for *every* line, and spawning processes is pretty
slow from Git for Windows' MSYS2 Bash).

I see these functions only used as part of an shorten-edit-expand
sequence. Why not do a git rebase-helper --edit-todo instead? Saves
another few process spawnings.

Something for yet another later followup patch?

D.