Re: bidi, auto-composition-mode [core dump]

[Angelo Graziosi <angelo.graziosi@alice.it>]

Il 21/04/2010 18.12, Eli Zaretskii ha scritto:
>> Date: Wed, 21 Apr 2010 10:05:30 +0200
>> From: Angelo Graziosi<angelo.graziosi@alice.it>
>> CC: emacs-devel@gnu.org
>>
>> OK. In my $HOME/.emacs.d/init.el file I have added this:
>>
>> ;; Use C-x 8 RET RIGHT-TO-LEFT MARK to write from right to left
>> (setq-default bidi-display-reordering t)
>>
>> Then, in Emacs, I do this
>>
>> C-x C-f foo.txt
>> C-x 8 RET RIGHT-TO-LEFT MARK
>
> Thanks, now everything is clear.  Emacs composes the RIGHT-TO-LEFT
> MARK (and other zero-width characters) with the next character, and
> compositions don't yet work with bidi reordering.  The effect is
> indeed duplication of characters.  You can see another example of this
> problem in HELLO, in the Arabic and Hebrew lines -- they also use RLM.

Just now, I have discovered (with rev. 100032) that Emacs does not like 
any more this:

(setq-default bidi-display-reordering t)

in my initialization file: it aborts!

To reproduce: add the above to .emacs (or to .emacs.d/init.el) file; 
then 'short circuit' the desktop file, if any. For example renaming it:

mv desktop desktop.save

In this way Emacs should starts with the 'scratch' buffer.

Then

$ emacs &

aborts. If you want to use the desktop file, after Emacs is started, you 
should switch buffer up to the 'scratch', for example clicking with 
mouse-1 on buffer name in the mode line: then switching from 'Messages' 
buffer to scratch' causes Emacs to abort.

In short, Emacs does not like the above (setq...) in .emacs and the 
'scratch' buffer.

I have verified this both on GNU/Linux Kubuntu 9.10 and on Cygwin.

Ciao,
Angelo.