shell-command-on-region fooled by long lines

[Dan Jacobson]

shell-command-on-region on this:
  perl -le 'for(1..6){print $_ x 111}'
mistakenly thinks it is showing all the output in the minibuffer, so
it doesn't create new a new buffer for the output, when in fact it
gets fooled by the wrapped lines. Adjust the 6 and 111 for your screen
if you don't see the effect. I was using Emacs.geometry: 81x35+-6+.
emacs-version"21.4.1"