Merge branch 'jk/diff-no-index-with-pathspec-fix' into maint-2.51

An earlier addition to "git diff --no-index A B" to limit the output with pathspec after the two directories misbehaved when these directories were given with a trailing slash, which has been corrected. * jk/diff-no-index-with-pathspec-fix: diff --no-index: fix logic for paths ending in '/'