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Re: Hang with markdown-mode


From: leo
Subject: Re: Hang with markdown-mode
Date: Mon, 25 Nov 2013 23:53:04 +1100

Still happens in 2.0.

I’m sure it’s a bug, but I’m interested in a suitable workaround: Where should 
fortifying normally be done: In the window-configuration-change-hook or 
elsewhere?

Thanks, Leo

On 25 Nov 2013, at 10:36 pm, Tim Visher <address@hidden> wrote:

> That sounds like a bug. You could report it to M. Blevins
> (http://jblevins.org/projects/markdown-mode/markdown-mode.el), but be
> advised that the latest version available on his site is 2.0 so you
> might want to try upgrading before you report the bug.
> 
> On Mon, Nov 25, 2013 at 1:52 AM, Leo <address@hidden> wrote:
>> The problem
>> -----------
>> 
>> I use markdown-mode 1.9 in emacs 24.3.1 and I get a consistent hang when I 
>> do the following:
>> 
>> 1.  Start emacs
>> 2.  Create a new file, say, with name changetest.txt.
>> 3.  Put (or keep) it in markdown-mode.
>> 4.  Write some text in changetest.txt and save the file to disc.
>> 5.  Switch to another buffer, so that that buffer changetest.txt is not
>>    visible.
>> 6.  Open the file changetest.txt in another editor.
>> 7.  Change and save the content in this other editor.
>> 8.  Go back to emacs and switch buffer to changetest.txt.
>> 
>> You will get the message
>> 
>>    changetest.txt changed on disk; really edit the buffer? (y, n, r or C-h)
>> 
>> But then emacs will hang; no input will get you through the question prompt 
>> and keyboard-quit does nothing, so you have to kill emacs.
>> 
>> Results of my investigation
>> ---------------------------
>> 
>> -  The problem arises only in markdown mode.
>> -  The "changed on disk" message is issued by
>>    ask-user-about-supersession-threat.
>> 
>> Via debug-on-error I was able to locate the problem a bit more in detail:
>> 
>> -  It seems like the hang occurs through an endless recursion or loop in 
>> markdown-check-change-for-wiki-link which is triggered when emacs switches 
>> to the changetest.txt buffer.
>> -  markdown-check-change-for-wiki-link is triggered through the 
>> window-configuration-change-hook hook.
>> 
>> Questions
>> ---------
>> 
>> -  How can I avoid this, but keep the
>>    markdown-check-change-for-wiki-link functionality?
>> -  Is window-configuration-change-hook maybe not the right hook to put 
>> markdown-fontify-buffer-wiki-links in?
>> 
>> Thanks, Leo
>> 




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