Hi,
Here is an example Org file:
------------
#+TAGS: [ tag1 : tag2 ] [ tag2 : tag3 ] [ tag3 : tag4 ]
* Tag1 :tag1:
* Tag2 :tag2:
* Tag3 :tag3:
* Tag4 :tag4:
------------
Searching headlines by tags works well unless you combine a group tag together
with some of its ancestor tags in the query.
1) GOOD - Searching for "tag1" marks all four headlines.
2) GOOD - Searching for "tag3" marks headlines "Tag3" and "Tag4".
3) BAD - Searching for "tag1+tag3" marks just headline "Tag3" providing an
incomplete result. Expected result: headlines "Tag3" and "Tag4" are marked.
With more complex tag set it may happen quite easily that such a search is done.
The bug seems to be in org-tags-expand.
(org-tags-expand "tag1")
#("{\\<\\(?:tag[1-4]\\)\\>}" 0 20 (grouptag t))
(org-tags-expand "tag3")
#("{\\<\\(?:tag[34]\\)\\>}" 0 19 (grouptag t))
(org-tags-expand "tag1+tag3")
#("{\\<\\(?:tag[1-4]\\)\\>}+tag3" 0 20 (grouptag t))
In the third invocation "tag3" was left unexpanded.
Best regards,
Martin
Emacs : GNU Emacs 25.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.26)
of 2018-02-09
Package: Org mode version 9.1.7 (9.1.7-12-g74f6ed-elpaplus @
/home/martin/.emacs.d/elpa/org-plus-contrib-20180305/)
