chrome_print and shiny

[thomas-schertler]

I used the demo app of RLesur (https://github.com/RLesur/chrome_print_shiny) to print a simple
shiny app to pdf, using the chrome_print() function together with the URL of the shiny app in the RStudioIDE.
That works so far, but the selected dynamic elements (selected radiobuttons, checkboxes and dropdowns) are not
showing the actual selection.

shiny_to_pdf1.R.txt