shiny.express.modal() should be a context manager

[schloerke]

Because a modal is similar to a card, I thought I'd be able to write:

from shiny.express import input, render, ui


with ui.modal():
    ui.input_slider("n", "N", 0, 100, 20)
    
    
    @render.code
    def txt():
        return f"n*2 is {input.n() * 2}"

Live app link

Current output

This occurs because shiny.express.modal is currently a re-export of shiny.ui.modal. I believe it should be an express context manager, similar to with shiny.express.h1():