unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
From: JD Smith <jdtsmith@gmail.com>
To: 65105@debbugs.gnu.org
Subject: bug#65105: Reusing the same string as 'display on consecutive characters evades display
Date: Sat, 5 Aug 2023 14:35:23 -0400	[thread overview]
Message-ID: <E5E1439B-082D-4A65-8F0C-E3BA4026BE26@gmail.com> (raw)

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.






             reply	other threads:[~2023-08-05 18:35 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-05 18:35 JD Smith [this message]
2023-08-05 19:03 ` bug#65105: Reusing the same string as 'display on consecutive characters evades display Eli Zaretskii
2023-08-05 20:49   ` JD Smith
2023-08-05 22:46     ` Dmitry Gutov
2023-08-05 22:49       ` JD Smith
2023-08-06  4:55         ` Eli Zaretskii
2023-08-06  4:54       ` Eli Zaretskii
2023-08-06 17:48         ` Dmitry Gutov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=E5E1439B-082D-4A65-8F0C-E3BA4026BE26@gmail.com \
    --to=jdtsmith@gmail.com \
    --cc=65105@debbugs.gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).