add adoptedStyleSheets to the options

[rhildred]

When options.shadow == true, it would be helpful to add to adoptedStyleSheets so that one can have scoped css.

const sheet = new CSSStyleSheet(); sheet.replaceSync("h1 { color: blue; border: 2px dotted black;}"); register(App, "x-rich", [], {shadow:true, adoptedStyleSheets:[sheet]});

[rschristian]

Great idea, thanks! Sorry it took us so long to merge.

[rhildred]

Thanks for this. I will test and delete my npm package when you make a new one.