[EMoji Sample App] Scrolling is not working properly

[vikaspw]

when i scroll the list, it's not reaching to last page, it just stuck before that and scroll to same random page.

[vikaspw]

video
When I scroll down past item 60, it keeps jumping back to item 40.

[JakeWharton]

Is this the views or Compose UI variant?

[vikaspw]

Compose ui *Thanks & RegardsVikas GuptaSenior Staff Engineer*

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On Thu, 25 Sept, 2025, 08:16 Jake Wharton, ***@***.***> wrote: *JakeWharton* left a comment (cashapp/redwood#2833) <#2833 (comment)> Is this the views or Compose UI variant? — Reply to this email directly, view it on GitHub <#2833 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BNJQBC2PIYL6H4ALBW5YDJL3UNJQZAVCNFSM6AAAAACHLMOM42VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTGMZRGYZDSOBQGY> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[vikaspw]

@JakeWhartonI noticed that the following properties are not being used:

public var itemsBefore: Int by mutableIntStateOf(0)
public var itemsAfter: Int by mutableIntStateOf(0)

Also, there’s still a pending TODO:

// TODO Fix item count truncation

Since these are already working correctly in the View-based implementation, could you share if there’s a timeline for when this will be addressed in the Compose implementation?
Additionally, can you outline what’s currently missing in the Compose UI implementation and what needs to be fixed to achieve parity?

[JakeWharton]

There is no timeline. We have started working on Compose UI support in passing, but no one is dedicated to it right now. Part of working on it is figuring out what even is needed to fully support it (as well as SwiftUI).

[vicky-tech]

@JakeWharton what about this specific issue.. do you guys know what is the problem in the lazyList , as i can see it's working in view implementation.. any approach to fix ?

[JakeWharton]

I do not. Our only usage of Compose UI today is in these samples, so no one is really looking at it right now. Once we get Compose UI to a higher priority then someone will have to look.

[vicky-tech]

I’ve identified the bug, and it appears to be in ScrollOptimizedLoadingStrategy.
Could you help me understand its purpose? Since LazyColumn/LazyRow already optimize by composing only visible items and disposing views that go out of scope, I’m curious why this additional strategy is needed.

[vicky-tech]

@JakeWharton

[JakeWharton]

I didn't build it. I assume it manages prefetch across the JS bridge whereas the built in one is synchronous.