GNU bug report logs - #32276
char-width of a space is 0 when display-table entry has a face.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Keith David Bershatsky <esq <at> lawlist.com>
Subject: bug#32276: closed (Re: bug#32276: char-width of a space is 0 when
 display-table entry has a face.)
Date: Fri, 27 Jul 2018 09:35:02 +0000

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Your bug report

#32276: char-width of a space is 0 when display-table entry has a face.

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 32276 <at> debbugs.gnu.org.

-- 
32276: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=32276
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Keith David Bershatsky <esq <at> lawlist.com>
Cc: 32276-done <at> debbugs.gnu.org
Subject: Re: bug#32276: char-width of a space is 0 when display-table entry
 has a face.
Date: Fri, 27 Jul 2018 12:34:30 +0300

> Date: Wed, 25 Jul 2018 20:33:33 -0700
> From: Keith David Bershatsky <esq <at> lawlist.com>
> 
> EXPECTED RESULT:  The char-width should be 1 in Step 2, just like in Step 4.

Thanks, fixed on the emacs-26 branch.

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From: Keith David Bershatsky <esq <at> lawlist.com>
To: Emacs Bug Reports <bug-gnu-emacs <at> gnu.org>
Subject: char-width of a space is 0 when display-table entry has a face.
Date: Wed, 25 Jul 2018 20:33:33 -0700

Step 1:  Open a newly built GUI version of Emacs master branch.

Step 2:  Open a scratch buffer and evaluate the following code:

;;; char-width == 0
(progn
  (fundamental-mode)
  (setq buffer-display-table (make-display-table))
  (aset buffer-display-table
        ?\s
        (vector (make-glyph-code ?· 'font-lock-warning-face)))
  (char-width ?\s))

Step 3:  The char-width in Step 2 is 0.

Step 4:  In the same or a different scratch buffer, evaluate the following code:

;;; char-width == 1
(progn
  (fundamental-mode)
  (setq buffer-display-table (make-display-table))
  (aset buffer-display-table
        ?\s
        (vector (make-glyph-code ?·)))
  (char-width ?\s))

Step 5:  The char-width in Step 4 is 1.

EXPECTED RESULT:  The char-width should be 1 in Step 2, just like in Step 4.

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