Hi Gustav,

currently, the remove functionality can also be accessed by C-u /. If we want to provide a dedicated hotkey, then the following definition will do it:

(add-hook 'org-agenda-mode-hook
          (lambda()
            (local-set-key (kbd "\") '(lambda()
                                        (interactive)
                                        (org-agenda-filter-by-tag nil nil 'exclude))))
          'append)

I would prefer to remove this function because it doesn’t add functionality. Keeping it around just adds another potential source of bugs.

Best,
Viktor

> Am 28.01.2016 um 09:27 schrieb Gustav Wikström <gustav@whil.se>:
> 
> Hi Kyle, Viktor and the group,
> 
> I'd say it's a naming-problem. What, really, is the purpose of the function? Because applying the proposed change essentially makes the function identical to the function it calls. Right? And that function is still available for the user, so a "refinement" can be done without the org-agenda-filter-by-tag-refine (bound to backslash (\) ) function. As of now, using the function to exclude tags in the agenda provides a direct access to that functionality, instead of calling org-agenda-filter-by-tag (bound to slash (/) ) plus pushing the minus key (-) to switch from filter to exclude.
> 
> If you want to make any change, I'd suggest to instead change the name of org-agenda-filter-by-tag-refine to org-agenda-filter-by-tag-exclude and to leave the code within the function as is (well.. maybe change 'refine to 'exclude with the same argument as to the function name change).
> 
> Best Regards
> Gustav
> 
> -----Original Message-----
> From: Kyle Meyer [mailto:kyle@kyleam.com]
> Sent: Tuesday, January 12, 2016 07:19
> To: Viktor Rosenfeld <v.rosenfeld@gmx.de>
> Cc: emacs-orgmode@gnu.org; Gustav Wikström <gustav@whil.se>
> Subject: Re: org-agenda-filter-by-tag-refine defaults to exclude
> 
> Hi Viktor,
> 
> Viktor Rosenfeld <v.rosenfeld@gmx.de> writes:
> 
>> Hi,
>> 
>> I noticed that org-agenda-filter-by-tag-refine started to exclude
>> selected tags by default recently because the 'refine in the call to
>> org-agenda-filter-by-tag is interpreted as an exclude flag.
> 
> This seems to have been introduced by 6c6ae99 (org-agenda: Filtering in the agenda on grouptags, 2015-01-24).
> 
>> The attached patch fixes this.
>> 
>> However, it seems that the function is superfluous because
>> org-agenda-filter-by-tag can filter on multiple tags as well if called
>> multiple times (that used not to be the case earlier).  So maybe it
>> should be deprecated and removed?
> 
> I agree.  Gustav, does that make sense given your changes in 6c6ae99?
> 
>> diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el index
>> d91b64d..21928de 100644
>> --- a/lisp/org-agenda.el
>> +++ b/lisp/org-agenda.el
>> @@ -7580,7 +7580,7 @@ to switch between filtering and excluding."
>> (defun org-agenda-filter-by-tag-refine (arg &optional char)
>>   "Refine the current filter.  See `org-agenda-filter-by-tag'."
>>   (interactive "P")
>> -  (org-agenda-filter-by-tag arg char 'refine))
>> +  (org-agenda-filter-by-tag arg char))
> 
>> (defun org-agenda-filter-make-matcher (filter type &optional expand)
>>   "Create the form that tests a line for agenda filter.  Optional
> 
> 
> --
> Kyle