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From: Eli Zaretskii <eliz@gnu.org>
To: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>,
	Kenichi Handa <handa@gnu.org>
Cc: 28312@debbugs.gnu.org, nick@tenpoint.co.nz
Subject: bug#28312: 25.2; Arabic script changes when scrolling
Date: Fri, 01 Sep 2017 11:35:38 +0300	[thread overview]
Message-ID: <83h8wm24v9.fsf@gnu.org> (raw)
In-Reply-To: <wly3pyzx8y.wl%mituharu@math.s.chiba-u.ac.jp> (message from YAMAMOTO Mitsuharu on Fri, 01 Sep 2017 16:36:13 +0900)

> Date: Fri, 01 Sep 2017 16:36:13 +0900
> From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
> Cc: Nick Helm <nick@tenpoint.co.nz>,
> 	28312@debbugs.gnu.org
> 
> 1. emacs -Q &
> 2. M-x describe-language-environment RET Arabic RET
> 3. Press and release the mouse button around the Arabic sample text.
>    (say, "Arabic" to the left)
> 
> The appearance of the sample text changes if I press the button, and
> it changes back again when I release it.

Thanks, I see this, too.  And it's a very old problem, I see it in
Emacs 24.3 already.

Also, the mouse is not necessary, I can see the problem if I scroll
the *Help* window created by "C-h L" either via the scroll bar or even
with "C-u 1 C-v".

I'm guessing that somehow we don't redraw enough characters to give
the font shaper a chance to shape them correctly.  CC'ing Handa-san,
in the hope that he could have some insights on this.





  parent reply	other threads:[~2017-09-01  8:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-01  1:03 bug#28312: 25.2; Arabic script changes when scrolling Nick Helm
2017-09-01  6:45 ` Eli Zaretskii
2017-09-01  7:36   ` YAMAMOTO Mitsuharu
2017-09-01  8:01     ` Alexis
2017-09-01  8:16     ` Andreas Schwab
2017-09-01  8:35     ` Eli Zaretskii [this message]
2019-06-06 14:04       ` Eli Zaretskii
2019-06-09 23:56         ` Nick Helm
2019-06-10 17:27           ` Eli Zaretskii
2019-06-11 14:49             ` Eli Zaretskii
2020-08-10 14:13               ` Lars Ingebrigtsen
2017-09-01  8:16   ` Nick Helm

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