Merge branch 'gt/add-u-commit-i-pathspec-check'

"git add -u <pathspec>" and "git commit [-i] <pathspec>" did not diagnose a pathspec element that did not match any files in certain situations, unlike "git add <pathspec>" did. * gt/add-u-commit-i-pathspec-check: builtin/add: error out when passing untracked path with -u builtin/commit: error out when passing untracked path with -i revision: optionally record matches with pathspec elements