[ESS-bugs] Alt+; pressed twice does not uncomment the block in SAS mode

[Rodney Sparapani]

Richard M. Heiberger wrote:

>I will confirm the problem.  I have an analysis at the end of this message.
>
>In myfile.s, highlight several lines, then press M-; .
>The entire region is now commented with a leading ##.
>Then re-highlight the same lines, and press M-; , now the commented
>region has its ## removed.
>
>In myfile.sas, highlight several lines, then press M-; .
>The lines are now prefixed with
>\*\|/\*
>and postfixed with
>;\|\*/
>
>This looks like an attempt to prefix with /* and postfix with */ but
>the escaping of special characters got scrambled.
>
>
>Now rehighlight the same region and again press M-; .
>We expect, based on the behavior in myfile.s, that the comment
>information would be removed.  It isn't removed.  Instead, another
>set is placed on each of the lines in the region.
>
>Now I see it.  SAS has two types of comments structures,
>the  * xxxx ;
>and /* xxxx */
>
>comment-dwim function (called by M-;) is doing something with the
>regular expression defining those comments and coming up with a scramble
>mixture of both commenting methods.
>  
>
Not sure what's going on there. But, a bigger problem for xemacs users is
that comment-dwim checks for transient-mark-mode which does not even
exist. This might be fixed in the near future, but until then use the two
functions comment-region and uncomment-region.

Rodney