Turn rectangle mark mode off in org mode in emacs

Question

How do I disable cua's rectangle mark mode when using org mode in emacs? Ctrl + Enter is used by both modes and I'd prefer to just lose cua's functionality when I'm in org mode since I don't usually need to select a rectangle when editing an org document.

I'm pretty sure I once had some code in my .emacs that performed this function but I can no longer find it anywhere online. Sadly I'm not enough of an elisp guru to figure it out myself.

Answer 1

I don't use CUA except for the rectangles, so I do

(global-set-key (kbd "C-<return>") 'cua-rectangle-mark-mode)

Org mode's bindings automatically override global bindings, so C-<enter> runs org-insert-heading-respect-content with no extra configuration.

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I assume you're using cua-selection-mode or cua-mode, though. Since it's global you can't turn it off in just org buffers. Probably the best thing is to define your own function and bind it to cua-mode's map.

(defun jpk/C-<return> (&optional arg)
  (interactive "P")
  (if (eq major-mode 'org-mode)
      (org-insert-heading-respect-content arg)
    (cua-rectangle-mark-mode arg)))

(define-key cua-global-keymap (kbd "C-<return>") #'jpk/C-<return>)

CUA does things kind of weirdly compared to most minor modes, so while the above works for me it might be wonky if your setup is different from mine.