Merge branch 'rp/apply-cached-with-i-t-a'

Recent versions of "git diff-files" shows a diff between the index and the working tree for "intent-to-add" paths as a "new file" patch; "git apply --cached" should be able to take "git diff-files" and should act as an equivalent to "git add" for the path, but the command failed to do so for such a path. * rp/apply-cached-with-i-t-a: t4140: test apply with i-t-a paths apply: make i-t-a entries never match worktree apply: allow "new file" patches on i-t-a entries