[R] History pruning

[Richard M. Heiberger]

We have different starting points.  Please be sure that your modularity
allows a cleaned region as well as a history log to be the input to your
next
step.  The history log is incomplete; lines sent to the *R* buffer by C-c
C-n are
explicitly excluded from history.  Lines picked up from a saved transcript
file aren't in history.  Will your program handle this correctly:

aa <- bb +
cc

?  It is valid code.  Suppressing the line with cc will make it not valid
code.


Rich