org-agenda: Filtering in the agenda on grouptags
Filtering in the agenda on grouptags filter also subcategories.
Exception if filter is applied with a (double) prefix-argument.
Filtering in the agenda on subcategories does not filter the "above"
levels anymore.
If a grouptag contains a regular expression the regular expression
is also used as a filter.
* lisp/org-agenda.el (org-agenda-filter-by-tag): improved UI and
refactoring.
Now uses the argument arg and optional argument exclude instead of
strip and narrow. ARG because the argument has multiple purposes
and makes more sense than strip now. The term narrowing is changed
to exclude.
* lisp/org-agenda.el (org-agenda-filter-by-tag-refine): name change in
argument to match org-agenda-filter-by-tag.
* lisp/org-agenda.el (org-agenda-filter-make-matcher): new optional
argument EXPAND and refactoring.
* lisp/org-agenda.el (org-agenda-filter-make-matcher-tag-exp): new
function, previously baked into org-agenda-filter-make-matcher.
* lisp/org-agenda.el (org-agenda-filter-apply): New optional parameter
EXPAND, used in call to org-agenda-filter-make-matcher.
* lisp/org-agenda.el (org-agenda-reapply-filters): Uses another
parameter (the new optional one) in call to org-agenda-filter-apply.
* lisp/org-agenda.el (org-agenda-finalize): use of new parameter in
call to org-agenda-filter-apply.
* lisp/org-agenda.el (org-agenda-redo): Use of new parameter in call
to org-agenda-filter-apply.