bug#43789: 27.1; Dired cannot handle file which name contains linebreak

[Drew Adams]

> > 1. Use touch from coreutils or find-file in Emacs to create a file
> > which name contains a linebreak. (e.g. "line\nbreak")
> > 2. Visit it in dired, you cannot do anything with this file because
> > the characters after "\n" was ignored by dired.
> 
> I recommend to avoid file names containing line breaks. Tramp, for
> example, cannot handle them at all.

And it's likely to mess up font-locking and other
Dired features that expect a newline to indicate
the end of a Dired line.

Dired, and other line-oriented displays, are a bit
fragile in this respect.