Bugzilla

Thanks for looking into this!

Here's the implementation of the threshold detection: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/gestures/AnchoredDraggable.kt;l=1398-1432;drc=64c19e2612ecaca5c53a3f7b96d7b4fec2991709

It gets the velocity in onDragStopped by calling Velocity.toFloat: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/gestures/AnchoredDraggable.kt;l=430;drc=64c19e2612ecaca5c53a3f7b96d7b4fec2991709

And Velocity.toFloat is aware of the scroll direction, and gets the correct directional component: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/gestures/Scrollable.kt;l=606;drc=01d017d5f115f8ff9cb1555b6e25daf651ac7b71

So I think our threshold of 150 dp per second might just be really really low.

Thanks for looking into this!

Here's the implementation of the threshold detection: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/gestures/AnchoredDraggable.kt;l=1398-1432;drc=64c19e2612ecaca5c53a3f7b96d7b4fec2991709

It gets the velocity in onDragStopped by calling Velocity.toFloat: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/gestures/AnchoredDraggable.kt;l=430;drc=64c19e2612ecaca5c53a3f7b96d7b4fec2991709

And Velocity.toFloat is aware of the scroll direction, and gets the correct directional component: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/gestures/Scrollable.kt;l=606;drc=01d017d5f115f8ff9cb1555b6e25daf651ac7b71

So I think our threshold of 150 dp per second might just be really really low. You can cross a lot of distance if you move your finger across the screen for a full second, even at a slow speed.