add shallow routing

[tomasweigenast]

It could be a nice feature to have. It is based on the NextJs routing system that allows pushing a new route without reloading the page completely: https://nextjs.org/docs/pages/building-your-application/routing/linking-and-navigating#shallow-routing

maybe something like: context.navigateTo(const CounterPage(), shallow: true); being the current route CounterPage obviously.