how to check out specific files from another branch, if those files have since moved

git-ref.sh

git clone $myrepo.git

# bring repo up to date
git checkout master
git pull

# change to PR branch
git checkout reorg_issues_dir

# move test out of the "new folder" created in PR
# since master doesn't know about the new folder
git mv $folder_with_changes .

# bring in our changes
git checkout master $folder_with_changes

# move them back to the "new folder"
git mv issue_* issues

# add changes to the PR 
git commit issues/ -m "reflect latest tests"

# push to the PR
git push origin reorg_issues_dir