Set window resolution

[Tazovsky]

Is it possible to set window resolution? Or if it's not, it would be very useful to be able to set it.

[bersbersbers]

Yes, compare https://github.com/rstudio/shinytest/blob/d0f6d737919b542c6a1e8bbd0ea05f9e4b3f5334/R/shiny-driver.R#L115-L123