GNU bug report logs - #65105
Reusing the same string as 'display on consecutive characters evades display

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Package: emacs;

Reported by: JD Smith <jdtsmith <at> gmail.com>

Date: Sat, 5 Aug 2023 18:36:01 UTC

Severity: normal

Tags: notabug

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

Bug is archived. No further changes may be made.

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

From: JD Smith <jdtsmith <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Reusing the same string as 'display on consecutive characters evades
 display
Date: Sat, 5 Aug 2023 14:35:23 -0400

Evaluate:

(let ((s1 "test1")
      (s2 "test2"))
  (insert "\n"
          (propertize " " 'display s1)
          (propertize " " 'display s1)
          (propertize " " 'display s2)
          (propertize " " 'display s1)))


The first space display does not take effect, since the s1 string is used for two consecutive characters.  This has a practical impact for font-lock backends that use the ‘display text-property and would like to minimize string allocation.  

Tested Emacs 27/28/29.
This bug report was last modified 1 year and 290 days ago.

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