[Feature] M-p: git-commit-prev-message

[Bob Leers]

M-p runs the command git-commit-prev-message (found in git-commit-mode-map), which is an interactive native-compiled Lisp
function in ‘git-commit.el’.

It is bound to M-p.

(git-commit-prev-message ARG)

Cycle backward through message history, after saving current message.
With a numeric prefix ARG, go back ARG comments.