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

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Package: emacs;

Reported by: Keith David Bershatsky <esq <at> lawlist.com>

Date: Thu, 26 Jul 2018 03:35:02 UTC

Severity: normal

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

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.
This bug report was last modified 6 years and 301 days ago.

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