I'm reproducing the Russ Charif' s post on May 18, 2016 to the https://support.rstudio.com.
Indeed the following Rstudio feature it'ld be very useful and comfortable to me.
"Feature request: horizontal split panes in source editor
It would be useful to be able to simultaneously view two parts of a source file that are farther apart from each other than can be viewed in a single window.
Ideally I'm thinking of a way to split a window into two independently-scrolling panes, one above the other. MS Word [shudder] has a feature like this, which is very useful in long docs. An alternative solution would be to allow the same source file to be open in two different windows.
Or does some such capability already exist?
Thanks for the great product!
Russ Charif May 18, 2016 15:56"
If it would be possible to implement it, I would very much appreciate it.