Fix the scroll bar thumb jumping when at the end of the LazyStaggeredList with more than one lane and improve smothness of the scroll

[rodrigodiasferreira]

What I have done and why Bug fix: scroll bar thumb jumping when at the end of the LazyStaggeredList with more than one lane, issue described in: https://github.com/android/nowinandroid/issues/1526.

[rodrigodiasferreira]

I also transfered the improvement on the smoothness of the scroll from the PR: https://github.com/android/nowinandroid/pull/1550, into this one, as the generic abstraction was not accepted.

[Jaehwa-Noh]

Could you add the result screen video?

[rodrigodiasferreira]

Hi @Jaehwa-Noh , sure.

Before: before.webm

After: after.webm

[tunjid]

Changes look good to me, I don't work on this project anymore so leaving to the maintainers to approve and merge.

[anhtuannd]

Really nice workaround. I have just checked and found out that fix from Google was included in androidx.compose.foundation:foundation:1.8.0-alpha01.

Now we are using 1.8.0-alpha07, so we can just retest the latest code to make sure the issue no longer exists.