bug#11934: 24.1; provide variable for pp.el to control max display width

[Lars Ingebrigtsen <larsi@gnus.org>]

"Drew Adams" <drew.adams@oracle.com> writes:

> The request is to provide a variable that controls the width of the
> displayed expression, or at least tries to as much as possible.
>
> For example, I have a variable whose value is this:
>
> (bbdb-complete-name comint-completion-at-point
> comint-dynamic-complete-filename comint-replace-by-expanded-filename
> ess-complete-object-name gud-gdb-complete-command Info-goto-node
> Info-index Info-menu lisp-complete-symbol lisp-completion-at-point
> minibuffer-default-add-completions read-char-by-name read-color
> read-from-minibuffer read-string recentf-make-menu-items)

[...]

> It would be good to be able to bind a max-width variable that lets the
> pp functions know that it is better, if possible, to insert newline
> chars to try to keep the width below that var's value.

I agree.  What pp does now with simple lists isn't optimal.

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