[ESS] automatic breaking of long lines in *.R buffer

[Stephen Eglen]

 > After apt-get upgrade ing my debian sarge system last night the behaviour 
 > of long lines in a buffer displaying a *.R file has changed undesirably: 
 > if I try to add a space at the end of a line that has got to 70 characters 
 > long, the cursor (and the preceding word) jump down to the next line. It's 
 > quite annoying and results in illegal code if you're in the middle of a 
 > comment.
 > 
 > This doesn't happen in a *.txt buffer, nor in the buffer with the R 
 > process. Therefore I thought maybe I was justified in seeking help here. I 
 > tried toggling options->display->wrap long lines but with no apparent 
 > effect. I didn't come across any hopeful sounding M-x variable names to 
 > change, but I bet this is not a difficult problem to solve...
 > 
 > I have to admit I'm not sure which of ess / XEmacs actually were upgraded, 
 > nor do I know how to find out.

This is an unintended side effect of ESS 5.2.6; should be fixed in
5.2.7.  

Stephen