From mboxrd@z Thu Jan  1 00:00:00 1970
From: Carsten Dominik <dominik@science.uva.nl>
Subject: Re: org-mode font-locking clobbers the rear-nonsticky text property;
 for other modes it doesn't
Date: Thu, 4 Oct 2007 10:44:50 +0200
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To: Tom Weissmann <trmsw@yahoo.co.uk>
Cc: emacs-orgmode@gnu.org


On Oct 3, 2007, at 11:34, Tom Weissmann wrote:

> I am trying to work out why font-lock for Org-mode changes the 
> rear-nonsticky
> property of text I insert, while it doesn't do it for other modes.
>
> For example:
>
> (with-current-buffer
>     (get-buffer-create "foo")
>   (insert (propertize ";;Try adding text after this ->"
> 		      'read-only t
> 		      'face 'underline
> 		      'rear-nonsticky '(read-only))))
>
> In the "foo" buffer you will be able to add text after the arrow. 
> Turning on
> lisp-interaction mode will fontify the text as a comment, but if you 
> delete the
> text you added you'll still be able to add some more - whereas in 
> org-mode you
> can't.
>
> Does anyone know why this happens and how I can prevent it?

Hi Tom,

the reason is this:  Org-mode uses font-lock to activate links and 
dates,
and it adds a rear-nonsticky property to make sure that the properties
behave well.   Because of this, the unfontification function I wrote for
org-mode does remove the rear-nonsticky property indiscriminately.
I did not know that you can select the individual properties that 
should be
non-sticky - I only learned that from your example.  Thanks!

This problem will be fixed in 5.11.

- Carsten