[R-SIG-Mac] Error message folding/unfolding code in R GUI

[Matt]

Hi, I occasionally get the following error message when folding/unfolding
code in the R GUI (not RStudio) for Mac. I haven't been able to narrow down
how to get it to happen consistently, but I see it a lot when
folding/unfolding functions I have placed consecutively at the beginning of
my script. The huge index number listed is the same every time.
Also, I'm not sure if this is related, but whenever I fold up a section of
code, it'll "eat" the first non-whitespace character *after* the last
bracket. It doesn't affect the code at all, but the character gets folded
up with the rest.

2021-11-16 18:55:30.849 R[25042:5539797] *** RController: caught ObjC
> exception while processing system events. Update to the latest GUI version
> and consider reporting this properly (see FAQ) if it persists and is not
> known.
> *** reason: *** -[__NSArrayM objectAtIndex:]: index 18446744073709551615
> beyond bounds [0 .. 555]
> *** name: NSRangeException, info: (null)
> *** Version: R 4.1.2 (81115) R.app R 4.1.2 GUI 1.77 High Sierra build
> Consider saving your work soon in case this develops into a problem.
>

-- Matt Loman

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