How to copy changes from one commit to another?

[whatisaphone]

Let's say I have some changes I want to copy from a to b. I can run jj squash -i -f a -t b, but this modifies the source commit. Is there a way to do the same thing, except copy the changes, not move them?

[steveklabnik]

I believe jj restore is what you want here.

[whatisaphone]

jj restore would copy the whole file (including changes in all ancestor commits), but I'm trying to apply the diff from just a single commit.

[jennings]

Use jj duplicate to duplicate the commit, then squash the duplicate.

[whatisaphone]

That worked, thanks!