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[bug #46914] .ce sometimes ignores right margin

From: G. Branden Robinson
Subject: [bug #46914] .ce sometimes ignores right margin
Date: Sun, 23 Apr 2023 21:00:58 -0400 (EDT)

Follow-up Comment #9, bug #46914 (project groff):

[comment #8 comment #8:]
> [comment #7 comment #7:]
> > This also makes sense as centering and filling are incompatible
> > goals.
> They aren't conceptually; this

> $ printf '.ce 2\nHello,\nworld!\n' | nroff | cat -s
>                              Hello,
>                              world!

> could have just as easily been designed to output

>                          Hello, world!

> but no roff ever written fills input lines while .ce is active, so the fact
that it _could_ have been done another way is a moot point.

Right.  Filling and centering together are otherwise known as ".ad c".

I think Bjarni is right that fill _mode_ and the `ce` _request_ are mutually
exclusive, unless we can imagine some `ce`-with-filling variant that is useful
and more easily implemented in the formatter than with some specialized

> Is the purpose of this change to require the user to explicitly disable fill
mode before calling .ce?  I disagree with that change,

I do too, _unless_ we can contrive some way .fi+.ce can populate output lines
that is useful, tractable to implement, and not duplicative of `.ad c`.

Right now my thinking is that fill mode plus `ce` is either not meaningful for
not worthwhile.  (This is not true of the superficially similar `rj`.)  The
formatter should therefore quietly suspend fill mode while counting `ce`
lines, and restore it (if it was active) when it runs out of lines to center.


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