From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jarmo Hurri <jarmo.hurri@iki.fi>
Subject: Re: Babel code indentation problem
Date: Thu, 03 Mar 2016 12:50:44 +0200
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References: <87mvqgouqy.fsf@iki.fi> <8737s7dg1q.fsf@pinto.chemeng.ucl.ac.uk>
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Eric S Fraga <e.fraga@ucl.ac.uk> writes:

> On Thursday,  3 Mar 2016 at 10:01, Jarmo Hurri wrote:
>
> [...]
>
>> So the problem is not in indentation in Processing mode itself, but the
>> error appears upon return from editing. This suggests that the issue 
>> is in the communication between the editing mode and Org mode. As you
>> can see, I have different indentation settings for C and Processing, so
>> that might be one thing that makes the difference appear.
>
> I think it is because you are using TABs to indent instead of spaces
> and therefore the indentation doesn't look right in the org mode view.
> You can tell emacs to not use tabs to indent and I think this will
> sort your problem out.

Yes! Problem solved with

(setq-default indent-tabs-mode nil)

Thank you very much!

Jarmo