Re: [PATCH] Use completing-read-multiple for org-set-tags-command

[Clemens]

> With the built-in completion, org-set-tags-command already supports
> completing multiple tags. 

Interesting, I couldn't figure out how. I tried with emacs -Q (v 26.3) 
and I get only completion for the first tag. If you try to get 
completion after entering the first you get an [no match] message. Maybe 
I'm doing something wrong? How do you get completion after the first tag 
with default completion?

> So that aim reduces to using
> completing-read-multiple because other completion libraries are more
> likely to play nicely with crm.
>
> At the moment that's not mentioned in the commit message (and, less
> importantly, it wasn't mentioned in the message introducing the patch),
> but in my view that aim should be the emphasis of the commit message.
> It'd be good to note the popular completion libraries that don't work
> out of the box with the current approach, and whether they do after this
> patch.

As described above my initial aim was really to get completion after 
entering the first tag (that is mentioned in my message introducing the 
patch but it is a good idea to mention it also in the commit). 
Completion frameworks automatically benefit from this if they support 
`completing-read-multiple`.

> It's also probably worth mentioning why org-tags-completion-function is
> still passed as the completion function to completing-read-multiple, as
> the completion function's main purpose of completing multiple tags could
> now be fulfilled by completing-read-multiple alone.  And what about the
> other spots that use org-tags-completion-function?

I haven't looked at `org-tags-completion-function` in detail will have 
to check if something could be adjusted there, too. I thought usages in 
other spots wouldn't be affected and should automatically work with the 
new enhanced behavior. I will look into that, had you something specific 
in mind?

Thanks for your review and help!