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From: Julius Dittmar <Julius.Muller@gmx.net>
Subject: Re: Disallow empty tags
Date: Tue, 3 Sep 2019 08:38:01 +0200
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Am 02.09.19 um 18:48 schrieb Dmitrii Korobeinikov:
> Creating an empty tag renders TAB-completion useless.
>
> Example:
>
> * Title =C2=A0 =C2=A0 :a::b:
>
> Pressing TAB in org-set-tags-command will now insert a colon `:`, which
> is quite puzzling to see.
> I thought something was wrong w/ my bindings till I noticed this was
> happening only in one of my files.
>
> Can such tags be ignored/disallowed as they hold no evident purpose?

I vote for ignored, because there's places where tag lists are displayed
like that, making newbies think that's valid syntax.

Where that happens? I have a file with a filetag R and a todo entry with
a tag :V: . In the agenda, that entry's tags are shown as :R::V: .

Yours,
Julius