Suggestion to increase usefulness of TAB key / 'org-cycle' function

[Philipp Kiefer <phil.kiefer@gmail.com>]

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To quote from the Org Manual:
"Org greatly simplifies the use of outlines by compressing the entire show
and hide functionalities into a single command, org-cycle, which is bound
to the TAB key."

Well, it could simplify things a good deal further if, on issuing the
command when point is *not* on a parent heading, (non-global) org-cycle
would instead fold the subtree that point is in, i. e. do
'outline-up-heading' and 'hide-subtree' on the parent heading. This would
make collapsing subtrees a lot easier and quicker as it could be done from
any non-parent position inside a tree. It is very noticeable when
collapsing multiple adjacent trees in succession.

Currently, hitting TAB when not on a parent heading merely returns an
'EMPTY ENTRY' message - not useful at all. 'Outline-up-heading' (C-c C-u)
has to be called manually each time before hitting TAB to achieve what the
user is most likely attempting to do anyway.

Personally, I doubt this change in behaviour would break much for users,
unless one were to assume that there is a lot of Elisp code out there that
relies on 'org-cycle' doing nothing in such cases, incurring the 'EMPTY
ENTRY' reprimand to boot, rather than first checking whether point is on a
parent heading. I don't see any drawbacks when 'org-cycle' is used
interactively.

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