bug#5715: 23.1.91; setting `truncate-lines' disables multiline minibuffer input editing

[Štěpán Němec]

Steps to reproduce:
emacs -Q
(setq-default truncate-lines t)

Now in the minibuffer, always only single line is displayed during input
editing (e.g. try M-x C-q C-j).

Same thing happens with Emacs 21 and 22, now I tried.

Am I the only one who fails to see why setting `truncate-lines' should
affect this?

I can use

(add-hook 'minibuffer-setup-hook (lambda () (setq truncate-lines nil)))

to work around that, but I find this really weird.


Best regards,

     Štěpán