Merge branch 'ci/commit--interactive-atomic'

* ci/commit--interactive-atomic:
Test atomic git-commit --interactive
Add commit to list of config.singlekey commands
Add support for -p/--patch to git-commit
Allow git commit --interactive with paths
t7501.8: feed a meaningful command
Use a temporary index for git commit --interactive

diff --cc Documentation/config.txt
Simple merge

diff --cc builtin/add.c
Simple merge

diff --cc builtin/commit.c
Simple merge

diff --cc commit.h
Simple merge

diff --cc t/t7501-commit.sh
Simple merge