GNU bug report logs - #489
Mouse highlighting bug

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Package: emacs;

Reported by: Chong Yidong <cyd <at> stupidchicken.com>

Date: Thu, 26 Jun 2008 21:50:05 UTC

Severity: normal

Done: Chong Yidong <cyd <at> stupidchicken.com>

Bug is archived. No further changes may be made.

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Report forwarded to bug-submit-list <at> lists.donarmstrong.com, Emacs Bugs <bug-gnu-emacs <at> gnu.org>:
bug#489; Package emacs. Full text and rfc822 format available.
Acknowledgement sent to Chong Yidong <cyd <at> stupidchicken.com>:
New bug report received and forwarded. Copy sent to Emacs Bugs <bug-gnu-emacs <at> gnu.org>. Full text and rfc822 format available.

Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: emacs-pretest-bug <at> gnu.org
Subject: Mouse highlighting bug
Date: Thu, 26 Jun 2008 17:39:02 -0400

There seems to be a bug is how mouse-face highlighting handles extending
faces to the end of the line:

(global-set-key [f1]
  (lambda () (interactive)
    (switch-to-buffer "asdf")
    (erase-buffer)
    (insert "123456\n890")
    (put-text-property 4 9 'mouse-face 'highlight)
    (put-text-property 4 9 'face (list :underline t))))

Put the mouse over the region with mouse-highlight, then remove it.
Result: the space after the first line becomes underlined.
Reply sent to Chong Yidong <cyd <at> stupidchicken.com>:
You have taken responsibility. (Mon, 22 Jun 2009 02:05:12 GMT) Full text and rfc822 format available.
Notification sent to Chong Yidong <cyd <at> stupidchicken.com>:
bug acknowledged by developer. (Mon, 22 Jun 2009 02:05:12 GMT) Full text and rfc822 format available.

Message #10 received at 489-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: 489-done <at> debbugs.gnu.org
Subject: Re: Mouse highlighting bug
Date: Sun, 21 Jun 2009 22:03:37 -0400

> (global-set-key [f1]
>   (lambda () (interactive)
>     (switch-to-buffer "asdf")
>     (erase-buffer)
>     (insert "123456\n890")
>     (put-text-property 4 9 'mouse-face 'highlight)
>     (put-text-property 4 9 'face (list :underline t))))
>
> Put the mouse over the region with mouse-highlight, then remove it.
> Result: the space after the first line becomes underlined.

I've checked a fix for this into the trunk, which involves changing
x_draw_glyph_string so that the underline (and overline) is not extended
into the end-of-line padding.  This is similar to the behavior of
strike-through.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> emacsbugs.donarmstrong.com. (Wed, 05 Aug 2009 14:24:11 GMT) Full text and rfc822 format available.
This bug report was last modified 15 years and 244 days ago.

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