[Rd] crash in R OS X GUI (PR#7903)

[pdbailey at uchicago.edu]

When I type an open paren the (otherwise absolutely wonderful)
help dialog at the bottom crashes R.

For example
> polygon(c(
[all is well
> polygon(c((
2005-05-27 14:13:14.843 R[478] *** -[NSCFDate
characterAtIndex:]: selector not recognized
2005-05-27 14:13:14.881 R[478] *** NSTimer discarding
exception 'NSInvalidArgumentException' (reason '*** -[NSCFDate
characterAtIndex:]: selector not recognized') that raised
during firing of timer with target 3c8350 and selector
'kickstart:'
------------

But I can't now reproduce it. Do you know about this bug? R is
a wonderful program and this experience has tought me just how
reliable I'm used to it being! Thanks a lot.

Paul