[ESS] Change in ESS affects Org generating images through R session

[Vitalie Spinu]

Yep. The recent eval cleanup dropped ess-quote-special-chars inadvertently. The
`string` argument must be wrapped in it.

I think the same should apply to ess-r-build-load-command.

  Vitalie

>> On Fri, Apr 08 2016 23:11, Lionel Henry wrote:

>> On 8 avr. 2016, at 23:10, Charles C. Berry <ccberry using ucsd.edu> wrote:
>> 
>> On Fri, 8 Apr 2016, Vitalie Spinu wrote:
>> 
>>>>> On Fri, Apr 08 2016 21:35, Lionel Henry wrote:
>>> 
>>>> I think this is linked to https://github.com/emacs-ess/ESS/issues/314>>> <https://github.com/emacs-ess/ESS/issues/314>>> 
>>> I don't think so. It concerns buffer evaluation only.
>>> 
>> 
>> I think the culprit is `ess-r-build-eval-command' which both ess-eval-buffer and ess-eval-function rely on.
>> 
>> The failures occur because of single quotes in `string' in each case here:
>> 
>> (concat cmd "('" string "'" args file ")\n")))

> Exactly.

> I'm struggling a bit with the new unit test macros. Will upload a fix soon.

> Lionel