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From: Florian Beck <fb@miszellen.de>
Subject: Re: emacs calc and src block editing
Date: Mon, 27 Jan 2014 00:10:02 +0100
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On 25.01.2014 13:49, Eric S Fraga wrote:

> There is a niggling aspect of editing source code blocks.  If, while in
> the src block buffer (reached by C-c '), if you start up calc and
> request "calc-copy-to-buffer" to place a result in the source code being
> edited, the copy is actually placed in the original org buffer and
> subsequently lost when exiting the src buffer.  In my opinion, the copy
> should be place in the src buffer at point.

It is a feature of calc, not to copy to internal (starred) buffers.

> I have no idea whether or how this could be fixed.  It's not a major
> problem but I thought I would mention it in case it's easy to fix.

I'm afraid the only way to fix this is inside calc. You can do it 
yourself with advice, e.g.:

(advice-add 'calc-find-writable-buffer
	    :before-until
	    (lambda (buf mode)
	      (if (and (string-match "\\`\\*Org Src"
				     (buffer-name (car buf)))
		       (get-buffer-window (car buf)))
		  (car buf)))
	    '((name . calc-copy-to-org-src)))

Remove it with:

(advice-remove 'calc-find-writable-buffer 'calc-copy-to-org-src)

HTH.