[ESS] Help - transient mark mode and eval-region

[Munawar Cheema]

I was looking for help on the following problem:

If I am edititing a .r file in ESS mode and I highlight a region in
transient mark mode, if I subsequently hit C-c C-r (eval-region) the mark
stays active and the region remains highlighted. I then have to use C-g to
remove the mark/highligting.  Irritatingly if I hit an editing key before
doing this I delete the region as I seem to be conditioned to assume the
region is no longer highligted.

I was wondering a) how to modify that and b) whether this should be the
default behaviour.  Most commands deactivate the mark after being applied to
the region.

Sorry if this message is in any way naïve as I am a bit of newbie.

Regards
Munawar Cheema
P.s. This may be a second submission of problem I don't know if first
attempt went through.