help: properly document the default pattern The default isn't to glob. It's relpath, which does no globbing at all. Thus most commands and options like -X/-I and hg files require `glob:` in front of them to actually do any globbing. I think long ago the default was to glob, but that hasn't been true for a long time.

Set up

  $ hg init repo
  $ cd repo

Try to import an empty patch

  $ hg import --no-commit - <<EOF
  > EOF
  applying patch from stdin
  abort: stdin: no diffs found
  [255]

No dirstate backups are left behind

  $ ls .hg/dirstate* | sort
  .hg/dirstate