Give a commit a new parent

Given I have these logical commits on two branches:

normalbranch: A - B - C - D

funkybranch: Z - Y - X

git co normalbranch
git rebase --onto X C

Then the logical commits of normalbranch will now be:

normalbranch: Z - Y - X - C - D

We've given commit C the new parent of X. C's hash will change and D's hash will change.

I use this when I build on top of a branch that I've already submitted for a PR. That branch will get merged into the new root branch, and then I'll need the new parent on the root branch for the commits that I'm currently working on.

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