When operating as separate Doctor Fates, Inza wears the helmet and Kent's original costume while...
– Google on helm separate history
When I press M-p in the Helm prompt for helm-git-grep I get a file path I entered previously in helm-find-files:

What I would really like to see is the pattern I searched with previously in helm-git-grep.
How to make Helm have separate mini-buffer histories for different kinds of Helm (helm-M-x, helm-mini, helm-git-grep and helm-find-files)?