ViewTransitions looses track of scroll position

[martrapp]

What version of astro are you using?

2.10.7

Are you using an SSR adapter? If so, which one?

None

What package manager are you using?

npm

What operating system are you using?

Linux

What browser are you using?

Chrome

Describe the Bug

When navigating back and forth with the keyboard, the client side router looses track of the correct scroll position.

What's the expected result?

When pressing back, forward, back, the second back should result in the same scroll position as the first.

I tried to figure out how the history, popstate and scroll status should work, but failed :-)

Link to Minimal Reproducible Example

https://stackblitz.com/edit/withastro-astro-rrjnk7?file=src%2Fpages%2Findex.astro

Participation

• I am willing to submit a pull request for this issue.

[martrapp]

first hints: seems that the scroll handler updates history(-1).state with history(0) scroll position during transition...

[martrapp]

I found an additional problem with throttling in the scroll event handler. It loses trailing scroll events.
For what the scroll handler does, the throttling here might be too much of a good thing.
Nonetheless, I've extended the throttling mechanism rather than removing it :)