[ESS] Automatic insertion of space after comma in iESS mode

[Andreas Leha]

Hi all,

coming "late" to this, I just wanted to add to "the other side".  I also
have (had?) the habit of introducing the space after the comma.  But I
think, two days of coding with a consistent smart comma are enough to
relearn.  So not much harm in activating the smart operators, which I
consider a great feature!

Best,
Andreas