GNU bug report logs - #38485
Customizing glyph widths

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From: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: casouri <at> gmail.com, 38485 <at> debbugs.gnu.org
Subject: bug#38485: Customizing glyph widths
Date: Thu, 5 Dec 2019 09:26:12 -0500

On 2019-12-04 22:34, Eli Zaretskii wrote:
>> Cc: casouri <at> gmail.com, 38485 <at> debbugs.gnu.org
>> From: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
>> Date: Wed, 4 Dec 2019 15:53:43 -0500
>>
>>> No, it will simply make each prettified symbol take up the same width
>>> as the original characters of the symbol that were composed.  Isn't
>>> that what everyone would want, and want for _all_ prettified symbols?
>>
>> Probably not.  In proof-general, we display 'forall' as ∀ and 'exists' as ∃.  In my own configuration I also change "Qed" to ■ "Defined" to □, and "Admitted" to 😱.  These shouldn't be widened, I think — especially not the last ones (there is a case to be made for widening forall, since otherwise we might get indentation issues, but in Coq Qed, Defined and Admitted don't introduce indentation changes, so it's safe not to widen them.
> 
> Are you saying that we _can_ not widen them, or are you saying that we
> _must_not_ widen them?  If the latter, can you explain why not?

That we must not.  I set up these prettifications specifically to make the characters narrower and reduce visual clutter; widening them would defeat that purpose.

I commonly write things like this:

  Lemma lcomm: forall x y, x ~+~ y <-> y ~+~ x.
  Proof. induction x; cbn; try rewrite IHx; reflexivity. Defined.

with prettification, it looks like this:

  Lemma lcomm: ∀ x y, x ⨤ y ↔ y ⨤ x.
  ∵. induction x; cbn; try rewrite IHx; reflexivity. □.

What I really want is this:

  Lemma lcomm: ∀ x y, x  ⨤  y  ↔  y  ⨤  x.
  ∵. induction x; cbn; try rewrite IHx; reflexivity. □.

but not this:

  Lemma lcomm: ∀      x y, x  ⨤  y  ↔  y  ⨤  x.
  ∵    . induction x; cbn; try rewrite IHx; reflexivity. □      .

Clément.

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