Jetpack Compose version: bom:2023.03.00

Jetpack Compose component used: BottomSheetScaffold

Android Studio Build: #AI-222.4459.24.2221.9682058 (Android Studio Flamingo | 2022.2.1 Beta 5)

Kotlin version: 1.8.10

Steps to Reproduce or Code Sample to Reproduce:

Implement BottomSheet from material library (not M3) which contains full-screen content
Start listening to the progress of bottom-sheet
Reprod repo is here: https://github.com/hbb20/BottomSheetIssue

Stack trace (if applicable): Screen recordings have been attached that shows the issue. Pay close attention to the progress value in screenshot which is the reported progress. The progress reported is not smooth for initial swipe of bottomsheet.

After updating compose-bom from 2023.01.00 (which uses 1.3.3 of compose-material) to 2023.03.00 (which uses 1.4.0 of compose-material) I started seeing issues with the bottom sheet progress callback.

My usecase: I need to calculate open-fraction of bottomsheet (i.e. when it's totally collapsed to it's peek height then open fraction is 0.0f and when it's fully expanded, open-fraction should be 1.0f).

Now based on this I need to derive few things like corner size, alpha and offsets of a few other elements. In short, if open-fraction is not reliable then UI will look shaky.

With 1.4.0 of compose-material, Bottomsheet started using SwipeableV2State which required quite some change for my usecase to work. Even then, the reported progress is not what I expected. After I start swipping up, the progress remains 0.0f until a certain point (I believe the point is SwipeableV2State.positionalThreshold but not sure). After that point, reported progress goes directly from 0.0 to 0.075 and skips progress in between.

https://user-images.githubusercontent.com/4918760/229168786-67611a02-2151-4b3a-a8bc-5944dec3f4f6.mov

Same thing happens when I start to collapse sheet from expanded state.

https://user-images.githubusercontent.com/4918760/229168780-b9cd6b93-1890-49cb-bde8-4fcb68c73c02.mov