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Re: artifacts in GNU CVS branch emacs-unicode-2

From: Katsumi Yamaoka
Subject: Re: artifacts in GNU CVS branch emacs-unicode-2
Date: Mon, 29 Jan 2007 11:11:57 +0900
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/23.0.0 (gnu/linux)

>>>>> In [emacs-w3m : No.09139] Trent Buck wrote:
> On Mon, Jan 29, 2007 at 06:04:24AM +1100, address@hidden wrote:
>> I start Emacs with a proportional font:
>>     emacs --enable-font-backend --font 'DejaVu Sans-8' --eval 
>> '(w3m-browse-url "http://en.wikipedia.org/";)'
>> I scroll up and down (C-v, M-v). I see 2 pixel underline to the right
>> of some lines.  The underlines should not be there; they are rendering
>> artifacts.

> Screenshot attached.

I guess the cause of this is that Emacs doesn't support the
Telugu language or the Telugu font is missing.  I got a similar
result[ScreenShot1] in the Fedora Core 6 system by running the
most recent Emacs 23 and setting the language environment to
English.  When I set the language environment to Japanese, those
garbage lines don't appear but an improper font is chosen for
the Telugu text[ScreenShot2].  Even if you don't have emacs-w3m
installed, you will see it by:

1. Start Emacs 23 using the options:
        -Q --enable-font-backend --font 'DejaVu Sans-8'
2. Set the language environment to English.
3. Eval the following form:

--8<---------------cut here---------------start------------->8---
(let* ((default-enable-multibyte-characters t)
       (buffer (get-buffer-create "*Telugu*"))
       (text (decode-coding-string "\
\214\320\272\320\260\n" 'utf-8)))
  (switch-to-buffer buffer)
  (dotimes (i (* 3 (window-height)))
    (insert text))
  (goto-char (point-min)))
--8<---------------cut here---------------end--------------->8---


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