IssueTracker

Hey Doris, any ideas on where this random animation could be coming from?

Re comment #1,

I tried the repro project locally. I was not able to reproduce in the the tip of tree compose code base, after dozens of attempts. It's possible the issue has been fixed recently.

Could you try the latest androidx snapshot here: https://androidx.dev/snapshots/builds and let us know if you still see the issue?

Thanks for the repro in comment #4. I'm able to repro the issue with the project in #4.

Initial investigation showed that the enter/exit transitions are correct. What appears like a scale animation is a size transform. During the repeated destination change, there seems to be a frame where the new content is resolved into an empty list of measurables, which is incorrect.

Unclear what's causing this yet - either the content composable is not yet populated for that frame, or the UI tree applier deferred adding the nodes to the tree to the next frame. More investigation will be needed.

The content composable is indeed empty. It comes from currentEntry being null here: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:navigation/navigation-compose/src/main/java/androidx/navigation/compose/NavHost.kt;l=693 Therefore, the measured size is 0, and the size animation kicks in to anmate that size change.

Over to Jeremy to investigate further in Navigation.