Hi, I'm proposing a new option in `org-show-context-detail', which shows
current headline, its ancestors, *and the entry itself*. This is useful
when export matched subtrees and their contents quickly with least
manual intervention.

Consider when working on different aspects of a project and taking notes
as we go:

* Project
A project tree
** Task1
** Task2
*** ASK Something to align
Something for discussion
** Task3
** Task4
*** ASK Something else to align
Something else.

At some point, we may wish to export only certain contents. For example,
to export headings with TODO keyword of "ASK", along with the task
context (ancestors TASK<N> heading name), and their own content for
discussion with colleagues. Ideally, this can be done by
org-sparse-tree, followed by org-export with visible-only + subtree-only
option.

Expected output:
* Project
** Task2
*** ASK Something to align
Something for discussion
** Task4
*** ASK Something else to align
Something else.

Current options, though, either require manual expansion to show both
ancestors AND entry, which becomes tedious soon;

* Project
** Task2
*** ASK Something to align
** Task4
*** ASK Something else to align

or it shows extra contents (`local' will include the *next* heading, in
this example, the non-related Task3)

* Project
*** ASK Something to align
Something for discussion
** Task3
*** ASK Something else to align
Something else.

`ancestor-with-entries' is a long name that pose some difficulties to
updating documentations, so I wish to have some feedbacks before moving
on. Is there better way to achieve this effect? Am I overlooking
something?

Yiufung