Re: Backspacing into folded items

From: Samuel Wales <samologist@gmail.com>
To: Lennart Borgman <lennart.borgman@gmail.com>
Cc: Bastien <bastien.guerry@wikimedia.fr>,
	Martin Pohlack <mp26@os.inf.tu-dresden.de>,
	Emacs developers <emacs-devel@gnu.org>,
	emacs-orgmode@gnu.org, David Abrahams <dave@boostpro.com>
Subject: Re: Backspacing into folded items
Date: Fri, 3 Sep 2010 08:44:54 -0700	[thread overview]
Message-ID: <AANLkTimjsUv8O_cR+gS4xD+CJyaey_ZRaxzbCUhtn7V=@mail.gmail.com> (raw)
In-Reply-To: <AANLkTimD6Ehe1L+dRruoqO8P-o=UC7Cha2rM+YRFkife@mail.gmail.com>

Dunno what is best, but when a solution is found, the following should
probably be tested to ensure that it is able to reverse the
non-editability:

  (let ((buffer-invisibility-spec))

On 2010-09-03, Lennart Borgman <lennart.borgman@gmail.com> wrote:
> On Fri, Sep 3, 2010 at 3:40 PM, Andreas Röhler
> <andreas.roehler@easy-emacs.de> wrote:
>>
>> Hi,
>>
>> posting forwarded herewith describes a design inconvenience, wich affects
>> common hide-show- and outline-modes too.
>>
>> As too different solutions have been proposed, let me suggest
>> "setting read-only property" rather than "use of a modification hook".
>>
>> Setting hidden text read-only should be more simple, straitforward - as
>> presumably hiding some code had some reasons.
>
>
> I recently filed a bug report about that hidden text in org-mode nodes
> did not get visible when you start to edit them. It turned out I was
> mistaken, I did not have reveal-mode on as I believed. However the
> plan is to make reveal-mode default:
>
>   http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6950
>
> How would making the text read-only or add a modification hook
> interact with the kind of problem reported in the bug above?
>
>
>> Editing hidden code is an error, which should be signaled rather than
>> cured
>> via hook.
>>
>>
>> Andreas
>>
>> --
>> https://code.launchpad.net/~a-roehler/python-mode
>> https://code.launchpad.net/s-x-emacs-werkstatt/
>>
>>
>> Am 26.08.2010 00:28, schrieb Martin Pohlack:
>>>
>>> Hi David,
>>>
>>> On 25.08.2010 11:22, David Abrahams wrote:
>>>>
>>>> I've gotten myself in trouble several times today by backspacing after
>>>> an org-link that ends a headline.  That's a typical pattern for
>>>> editing an org-link, right?  Well it turns out that if the item is
>>>> folded, then the backspace writes over the end of the un-folded item
>>>> but **appears to have no effect**, and you can easily hit backspace
>>>> several times to test your sanity before you realize that something is
>>>> wrong, badly corrupting your file.
>>>
>>> I have had similar such accidents, but not involving links.  You
>>> probably backspaced into the "..."?
>>>
>>>> Seems to me that attempts to edit a folded item should either:
>>>>
>>>> a) restrict changes to the item's headline, or
>>>> b) unfold the item and do nothing
>>>>
>>>> Is there a way to set that up?
>>>
>>> Just two quick ideas from me here:
>>> * You could add a modification hook to all hidden areas to unfold them
>>>   on modification, or
>>> * You could set the read-only property for all hidden areas.  This could
>>>   be setup at the same location where hiding is done.
>>>
>>> See also here:
>>>
>>> http://www.gnu.org/software/emacs/elisp/html_node/Special-Properties.html#Special-Properties
>>>
>>> I proposed a patch for image overlay which show a related problem here:
>>> http://patchwork.newartisans.com/patch/31/
>>>
>>> Cheers,
>>> Martin
>>>
>>
>>
>>
>>
>
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