Aleks,

Strings are handled as font-lock-string-face, which appears in ESS *.el
files only in ess-font-lock.el where alternate color
schemes are defined.  That means the iESS buffer is inheriting the
definition of a string from somewhere where strings are
defined only by double-quotes.  In lisp, the single quote is an important
part of the grammar and is not a string indicator, so that
is possible place.  In .r files we inherit from somewhere else where
strings can be delimited by single quotes.
Does this give you enough clues to suggest a repair?

Rich
2011/12/1 Aleksandar Blagotić <aca.blagotic@gmail.com>

> This one's bugging me for a while, and I never seemed to care about it
> much, until recently. As you can see in this image
> (http://i.imgur.com/w3JSH.png) the buffer on the left hand side
> formats strings within single quotes "properly", while I can achieve
> the same result in iESS buffer only for strings in double-quotes. I
> rarely use double quotes, unless I want to avoid escaping quotation
> marks. I reckon that this is an easy one, but currently I have no clue
> on this one. Any ideas?
>
>
> aL3xa
>
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