GNU bug report logs - #13999
24.3.50; rng-validate-while-idle -> (error "Selecting deleted buffer")

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From: Leo Liu <sdl.web <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 13999 <at> debbugs.gnu.org, Carsten Bormann <cabo <at> tzi.org>
Subject: bug#13999: 24.3.50; rng-validate-while-idle -> (error "Selecting deleted buffer")
Date: Fri, 22 Mar 2013 17:55:31 +0800

On 2013-03-20 12:30 +0800, Leo Liu wrote:
>> Yes, clearly a recipe would require killing the buffer in such a way
>> that the timer is not canceled.  While we may want to try and fix the
>> hole that lets this happen, I think it's still worthwhile to defensively
>> make rng-validate-while-idle check that the buffer is still live, since
>> the other problem may be anywhere in some unrelated code (potentially
>> external to Emacs) that let-binds kill-buffer-hook (for example).
>
> I fully agree. I'll see if I can get to the root of the problem while
> the OP is finding a recipe. IOW, I'll take care of this bug.

One possibility is the buffer is killed while timer-idle-list is
temporarily bound to nil, in this case the timer will be left in the
timer-idle-list and causing this error.

The code in rng-valid.el uses the following idiom to redisplay without
triggering idle timers.

(let ((timer-idle-list nil))
   ....
   (sit-for 0)
   ....)

Is there a way to do this without let-binding timer-idle-list?

Leo

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