Add BackstackEntry to $navigateBack

[vallemar]

When we want to navigate backwards, removing pages from the stack, it is not possible to do it if it is not done with the Frame.
An example of doing it manually is the following:

const frame = Frame.topmost()
const backStack = frame.backStack
const entry = backStack[0] // your destination here
frame.goBack(entry);

The problem with doing it manually and not through ns-vue is that custom routers lose navigation history

[rigor789]

The problem with doing it manually and not through ns-vue is that custom routers lose navigation history

That shouldn't matter if the custom router relies on the frame/page events to keep track of it's internal history. If the router implements it's separate history - that's going to be an issue in various cases where it can get desync'd from the actual state.

But regardless, this is useful to implement on the $navigateBack apis 👍

[vallemar]

I didn't know about these events, I'll take a look and try to change the plugin I'm using to vue3. thank you!