[O] How to move up/down a headline but not the subtree?

[Alain . Cochard]

Hello.  

I am aware of org-move-subtree-up/down, which moves the entire
subtree. 

I am also aware of org-shiftmetaup/down which moves the line[fn:1] (also
works for a headline).

What I would like to do is to be able to move a headline with
everything up to (but not including) its first subheading.

Does anyone know how to do that?  

I am also interested in knowing if there are specific (deep?) reasons
why this seemingly basic operation, which I see as the analogous of
org-do-promote/demote and perform very often with standard (but
tedious) emacs editing commands, is not already implemented.

Thanks,
Regards

PS: I know that worg is not org, but I take the opportunity to mention
that the Org-mode reference card seems to me to be outdated in this
respect (orgmode.org/worg/orgcard.html):

    M-S-UP/DOWN  move subtree/list item up/down

[fn:1] I am surprised I can't find it in the manual -- I find it
extremely useful.

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