Git get changes between hash A and B to working directory

Question

Some changes were made in git between hash A and hash B (the branch latest is in Z - thousands of commits later). I'd like to have the HEAD (my local one) point to hash A and have in my working directory all changes that were made between A and B.

Why? Because git diff is inconvenient and I'd rather work with the diff tool my IDE (IntelliJ IDEA) has. But for this I need to convince the IDE that I have changed files - hence the request.

Answer 1

I actually found a way:

git checkout <hash A>
git diff –patch <hash A> <hash B> > patch.patch
patch –p1 –N < patch.patch

A coworker also told me that I could've used

git checkout <hash A>
git merge --squash <hash B>

instead - but I didn't test it yet.