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bug#28312: 25.2; Arabic script changes when scrolling
From: |
YAMAMOTO Mitsuharu |
Subject: |
bug#28312: 25.2; Arabic script changes when scrolling |
Date: |
Fri, 01 Sep 2017 16:36:13 +0900 |
User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (Shijō) APEL/10.6 Emacs/22.3 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI) |
>>>>> On Fri, 01 Sep 2017 09:45:08 +0300, Eli Zaretskii <eliz@gnu.org> said:
>> With bidi enabled, Arabic text changes unexpectedly when scrolling
>> or moving point with the mouse.
>>
>> Recipe: Emacs -Q C-h h ;visit HELLO file ;use the mouse to scroll
>> slowly
>>
>> Observe the text on the line that starts with the word Arabic. As
>> the buffer scrolls, some of the characters in the Arabic
>> representations of the words "Arabic" and "Hello" change between at
>> least two glyphs.
> I don't see this here, but I'm not on Darwin. Can anyone reproduce
> this on GNU/Linux?
I could reproduce a similar effect also on Darwin, but a different
font backend driver (xft with libotf 0.9.3, m17n lib/db 1.7.0).
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.
The font used for displaying Arabic characters is "Arial Unicode MS".
YAMAMOTO Mitsuharu
mituharu@math.s.chiba-u.ac.jp