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kill-whole-line works as I want. It cuts the line, and when I'm in org-mode it cuts the whole collapsed subtree.
What I need is just that as copy instead of cut. There is a multitude of suggestions here how to copy a whole line, which all work, but in org-mode they simply do not copy the whole collapsed subtree, they just copy the first line.
How 'bout
(defun save-whole-line ()
(interactive)
(save-excursion
(forward-visible-line 0)
(let ((start (point)))
(forward-visible-line 1)
(kill-new (buffer-substring start (point))))))
The (forward-visible-line 0) was taken from kill-whole-line's source code, and the kill-new was taken from copy-region-as-kill's source code (both of which should be easy to find via C-h f <function-name> RET).
To copy an entire subtree (including the parts that are hidden) use C-c C-x M-w which runs org-copy-special
To copy an entire subtree (NOT including the parts that are hidden) you can mark the entire section and run C-c C-x v which runs org-copy-visible
(these work for Spacemacs 0.200.9@27.0.50 but I believe they also work for regular emacs)
save-*commands is performing the corresponding kill command and then immediately undoing/yanking the kill, e.g.C-kfollowed byC-y, as the former kill modifies thekill-ringwhereas the latter undo or yank does not.