Re: Tag references and tabs in help files

On Sun, Nov 4, 2012 at 11:25 AM, Tony Mechelynck
<antoine.mechelynck@gmail.com> wrote:
> On 04/11/12 13:48, Marcin Szamotulski wrote:
>>
>> On 11:53 Sun 04 Nov , Andre Majorel wrote:
>>>
>>> In help.txt, tabs are used as if help.vim didn't strip the "|"
>>> around tag references. Is it how it's supposed to be ?
>>>
>>
>>
>> See my other answer to your post. help.vim is not stripping "|", (and
>> also "*"). This is done by the conceal vim feature. If you have it
>> (:echo has("conceal")) then you can check where the 'cole' option was
>> set from: open a help file and run:
>> :verb set cole?
>>
>> Normally it is set in help.vim. So I guess you have overwritten it
>> somehow, or your vim/gvim has not conceal feature. See ":help 'cole'",
>> ":help 'cocu'", ":help conceal".
>>
>
> What the OP means, and I confirm it, is that when 'conceallevel' is 2 (as
> $VIMRUNTIME/ftplugin/help.vim sets it) the columns and indents in help files
> become misaligned. OTOH, setting 'conceallevel' to zero (either by an
> after-syntax plugin, or by running a feature-poor Vim compiled with
> -conceal, or even manually), the columns and indents align properly.
>
> I suppose that this is "how it is supposed to be", for several reasons:
> - The 'conceal' feature is relatively recent in mainline Vim (though it
> existed before as an unofficial patch). The help files are much more
> ancient, and of course when vanilla Vim did not have +conceal the help files
> took no account of the feature
> - There are still Vim versions (from Tiny to Normal) which are compiled
> without the feature. +conceal is present only in Big and Huge builds.
> - There are still diehard conservatives like me, who set 'conceallevel' to
> zero in help files
> - Vim's indent plugins mostly take no account of +conceal; they treat
> concealed text as visible text.
>
>

Okay I read :h conceal what exactly is the benefit of this setting?
Why would one use it?

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