Controlling what scroll position is saved

[posva]

Controlling what scroll position is saved
RFC at vuejs/rfcs#38 is not flexible enough: what about named views, what about scrolling multiple elements in the page.
A better option could be customising the computation of the scrollPosition saved in the history state as well as the restoration of that given scrollPosition. This would be a replacement for current scrollBehavior option and maybe we could internally refactor ours to do that

• VueRouter - Allow scrolling other than window rfcs#38

Another possibility is to move this to an official plugin similar to https://github.com/antfu/vue-router-better-scroller

Other things to take into account:

• Allow to manually save the scroll position (Version 4.6.0: Scroll to the top when reloading instead of maintaining the scroll position #2589). Useful to save the position after scrolling so reloading will see the correct position. This avoids using beforeunload event, which is crucial.
• It should be possible to save the scroll position without a native state (abstract history needs state?)