Rstudio progress bar handlers don't work by default

[aquasync]

Using options(cli.progress_handlers='rstudio') doesn't work, due to cli:::builtin_handler_rstudio$able() returning FALSE.

Looking at the code for the function, it is checking that .Platform$GUI == "Rstudio", while for me at least (runnning RStudio 2022.07), it is "RStudio", with a capital S.

At the moment I can work around by doing options(cli.progress_handlers_only='rstudio'), as that bypasses the $able checks, but it would be better to just do a case-insensitive check (assuming that it was indeed Rstudio at some point in the past).

Thanks,

Charles