[bug] org-columns for read only buffer (was Re: Bug: exporting ical files from read-only buffers [7.8.03 (release_7.8.03.112.g8861)])

[Eric S Fraga <e.fraga@ucl.ac.uk>]

Stephen Eglen <S.J.Eglen@damtp.cam.ac.uk> writes:

> I've found a small bug with exporting ical files from read-only org
> buffers.  Create a simple buffer, e.g.:
>
> * test1
>   <2012-01-12 Thu>
>
> and then hit C-x C-q to make the buffer read-only.  Then do C-c C-e i
> to export an ical file.  You get an error that the buffer is read-only.
>
> I think this is due to the call to org-refresh-category-properties,
> which can't update text proprties.  
>
> My workaround is to do:
> (setq inhibit-read-only nil)
>
> so that text properties can be added to read-only buffers.  This could
> be done locally within the ical export functions if others thought
> sensible, for which I can send a patch if desired.
>
> Stephen

I have just run into another case where text properties and/or overlays
clash with a read-only file: column view (M-x org-columns, C-c C-x
C-c).  In a read-only file, I get the error

   org-columns-compute-all: Buffer is read-only: #<buffer test.org>

If I make the file writable, org-columns works but, of course, does not
actually modify the file.

Thanks,
eric
-- 
: Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 24.0.92.1
: using Org-mode version 7.8.03 (release_7.8.03.122.g5b407)