`grDevices::dev.capabilities()` enhancements

[trevorld]

1. dev.capabilities() could also be used to query whether the current graphics device supports Unicode. In such a case I'd expect it to return FALSE if pdf() is the current graphics device and something else for the Cairo or Quartz devices.

   • https://stat.ethz.ch/pipermail/r-devel/2023-August/082845.html
   • A function that is my workaround for now

2. Add "Idle" as possible "event" in dev.capabilities("events"):

   • https://stat.ethz.ch/pipermail/r-devel/2022-April/081663.html
   • {eventloop} is an example package that needs to know the current graphics device supports the "Idle" event

[trevorld]

Add "Idle" as possible "event" in dev.capabilities("events")

This improvement was incorporated into R 4.4.3.

[HenrikBengtsson]

Add "Idle" as possible "event" in dev.capabilities("events")

This improvement was incorporated into R 4.3.3.

Thanks for getting this implemented and this follow up. I think you meant R 4.4.3 here; from https://cran.r-project.org/doc/manuals/r-release/NEWS.html

CHANGES IN R 4.4.3

• dev.capabilities()$events now reports "Idle" if the device provides it, fixing PR#18836, thanks to Trevor Davis.