Thanks for looking into it.  Detangling seems to work now but there is
one problem left:

If I open the org-buffer and the tangled files side by side, and then
detangle, both windows show the org-buffer afterwards.  I think
detangling should leave the buffers alone.  Perhaps there is a misplaced
save-excursion somewhere?

Thanks again, Nicolas!

  Titus

On 2016-01-31 Sun 11:50, Nicolas Goaziou wrote:
> Hello,
>
> Titus von der Malsburg <malsburg@posteo.de> writes:
>
>> I tangeled the following org-mode file:
>>
>>   #+BEGIN_SRC R :tangle /tmp/test.R :comments link
>>   1 + 2
>>   #+END_SRC
>>   
>>   #+BEGIN_SRC R :tangle /tmp/test.R :comments link
>>   3 + 4
>>   #+END_SRC
>>
>> The result was:
>>
>>   ## [[file:test.org][No\ heading:1]]
>>   1 + 2
>>   ## No\ heading:1 ends here
>>   
>>   ## [[file:test.org][No\ heading:2]]
>>   3 + 4
>>   ## No\ heading:2 ends here
>>
>> Then I changes “3 + 4” to “3 + 5”, revisited the org buffer, and
>> executed `org-babel-detangle'.
>>
>> Expected behavior: The second code block in org file is updated to contain
>> “3 + 5”.
>>
>> Actual behaviour: I find myself in a buffer containing test.R, the
>> cursor is inside the first code block at “1”, the second code block’s
>> content in the org buffer is highlighted, and I have an edit buffer for
>> that code block.  The content of the second code block is not updated.
>
> Fixed. Thank you.
>
> Regards,