dvHomeWidgetLaunchUrl function
The link a home widget's tap opens the application with.
scheme is the application's own URL scheme and route the route the
widget was generated for. Both native halves write this: Android's
provider puts it in the PendingIntent, and WidgetKit's view hands it to
widgetURL. One rule, because the runtime reads it back with
dvHomeWidgetRouteForLink and two spellings is a tap that opens the
not-found page on one platform and the right page on the other.
Implementation
String dvHomeWidgetLaunchUrl(String scheme, String route) =>
'$scheme://$dvHomeWidgetLaunchHost$route';