> this patch adds the possibility to query for the existence of sign ids
> using exists().
>
> Current idea is to use exists('#number') to check for the numeric id
> (and thus it can't be an autocommand).
I don’t like the overloading: exists('#…') is already ambigious*, don’t make it
more ambigious: it *can* be an autocmd group. I would rather suggest “>N” for
place ids and reserve “>>name” for defined sign names.
* “#abc” can mean “augroup” or “event”, same for “#abc#pattern”. Also note that
autocmd group name can contain a hash (and even a space which prevents using it
in :doau). Thus there is no way to check whether random autocmd group is
defined using “exists()” (“#abc#def” is always “#event_or_group#pattern”).
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