Hello,

That is exactly what happened. I reread the helper and now it is obvious
that "Root" is among the parents also. I didn't realized that at the time.

Thanks Kyle and Adrian for the clarification.

Lem

On Sun, Sep 16, 2018 at 4:29 PM Kyle Meyer <kyle@kyleam.com> wrote:

> Hello,
>
> Lem Ming <ramboman777@gmail.com> writes:
>
> > In the agenda list `org-agenda-list` buffer, when I do
> > `org-agenda-filter-by-top-headline` when the point is over a line with a
> > headline, nothing is filtered.
> >
>
> I've never used org-agenda-filter-by-top-headline, but taking a quick
> look at it and its helper, org-find-top-headline, the intention seems to
> be to find the level-one parent of the current heading.  So, in your
> example,
>
> > * Root
> > ** TODO task 2
> > :tag_2:
> >    DEADLINE: <2018-09-14 Fri 12:00:00>
> >    :PROPERTIES:
> >    :ADD_TIME: <2018-09-07 Fri 23:47:00>
> >    :END:
> > *** TODO task 2.1
> >     DEADLINE: <2018-09-14 Fri 11:00:00>
> >     :PROPERTIES:
> >     :ADD_TIME: <2018-09-07 Fri 23:47:00>
> >     :END:
> [...]
> > ** TODO task 7
> >    DEADLINE: <2018-09-14 Fri 12:00:00> SCHEDULED: <2018-09-12 Wed
> 10:00:00>
>
> ... it'd find "Root" if point were on any of the tasks.  If I'm reading
> your report correctly, you're assuming that with point on the "task 2",
> it'd take *that* as the top-level heading and filter to all the tasks
> under it (task 2.1, etc).  Instead, it finds "Root" and filters to
> everything thing under that, which---in your example file---is the same
> thing, so you don't see any change.
>
> --
> Kyle
>