feat(scroll): use manual scrollRestoration with scrollBehavior

[Dzinlife]

Browser default to perform a scroll when popstate happens which cause a glitch especially when using vue-router async scroll.

window.history.scrollRestoration = 'manual';

Fix by adding this line.

[posva]

Could you provide a repro illustrating the problem, please? You can use this fiddle or provide an HTML page

[Dzinlife]

http://jsfiddle.net/Lfeg5dtw/

I use a router transition so you can see it clearly.
Scroll to the bottom of /Foo and click the back button, the browser will perform an unexpected scroll.

[yyx990803]

You can simply set this up in your own code - forcing it to always manual seems less flexible.

[yyx990803]

On another thought - maybe this is a good default to have.

[kchq]

Let's get this bad boy in here, eh?