ess-mode; suggestion for ess-eval-line-and-next-line

[Rich Heiberger]

I would like this new function as an additional function, not as a replacement
for the present capability.  Here's why.

I frequently want to create a transcript of a session in which vertical spacing
and structured comments appear where I placed them.  At present, empty lines
do not get sent over to the S process by C-c C-n and friends.  I find that
I must use the mouse to pick up the relevant code, sometimes the entire buffer,
and drop it into the S+4 commands window.

Here is my recommendation.  Take Stephen's proposal and put it on C-c C-n.
Take the current version of the function and advertise that it is available
on C-c C-e C-n (which it has been for some time).  Change the current function
so that it does send over blank lines.

With this set of revisions, the new C-c C-n will send only executable lines
and the new C-c C-e C-n will send all lines---including comments and blanks
(which to me function as comments since they demark sections of the code).

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