Read the thread next time. I started by asking if there's a fixer and then someone suggests a single command that absolutely doesn't solve the problem and would take enormous time to use on some projects, even more so if your PC isn't the best of the best.
Are you thinking about rebasing through an IDE? IDEs are uniformly terrible at git.
I am not thinking about rebasing trough an IDE. Try rebasing in Chromium's repository, it's simply not fast. The thing I asked for is something that would auto-fix the entire commit histories in cases such as the Requests repository, the suggested use of rebase is too tedious and slow. Has something still remained unclear?
The intent for a tool which could do this quickly is unclear. Rebasing millions of commits will be slow, also rebasing published history will also generate a lot of extra paperwork.
Writing a utility to sort a rebase todo by message and change the later commits with the same message to be fixups is trivial.