Fix horizontal ScrollView resting past its left edge after a fling on Android 14

[YevheniiKotyrlo]

Summary:

On Android 14, a horizontal ScrollView resting at its left edge, dragged further left and released while moving, comes to rest 6 dp past that edge and stays there until it is touched again: the content shows a gap and the view reports a negative offset. In right-to-left layout the left edge is the reading end, so a list flung toward its end sticks the same way.

ReactHorizontalScrollView.fling() always starts its own overscroll fling (minX = 0, overX = width / 2), where the platform's HorizontalScrollView.fling() absorbs a fling into an edge effect that is still pulled. computeScroll() clamps the overscroll to mOverflingDistance and springs back, but Android 14's consumeFlingInStretch() feeds every spring-back step into the stretch the drag is still pulling, so the scroller finishes at 0 and the view stays at −6 dp. Android 15 adds the guard that prevents it (if (scrollX < 0 || scrollX > getScrollRange()) return unconsumed;), and Android 13's HorizontalScrollView has no consumeFlingInStretch.

This hands a fling that heads into the left edge the view rests at to super.fling(), so the platform absorbs it into the edge effect as it does for a plain HorizontalScrollView. Every other fling keeps React Native's own path. The vertical ScrollView is not affected: ScrollView.onTouchEvent releases through flingWithNestedDispatch, which absorbs a fling into an edge the view rests at and never calls fling().

Changelog:

[ANDROID] [FIXED] - Fix horizontal ScrollView resting past its left edge after a fling on Android 14

Test Plan:

• New ReactHorizontalScrollViewFlingTest (Robolectric, sdk = 34) drags a horizontal ScrollView at its left edge further left and releases it. On main it rests at scrollX = -6 (expected:<[0]> but was:<[-6]>); with this change at 0. A second case flings into the content, so the drag is shown to produce a real fling. Robolectric's ShadowEdgeEffect turns edge effects off on API 31+, so the test supplies a shadow that keeps the stretch a device uses.
• ./gradlew :packages:react-native:ReactAndroid:testDebugUnitTest: 707 tests pass. yarn format-check-kotlin and yarn format-check-java pass.
• RNTester on an Android 14 (API 34) emulator: after the same fling, Item 0 rests 18 px right of where it sat without this change and where it sat with it — before/after.

[YevheniiKotyrlo]

Device evidence — before / after

UNFIXED — flung toward its left edge from rest, the strip stops 6 dp past that edge and stays there.

FIXED — the same fling leaves the strip at its edge.

before — main	after — with this PR

RNTester's ScrollViewExample/horizontalScrollTo on an Android 14 (API 34) emulator, 1140×2400 at density 480, built from the same commit with and without this change. After a fast swipe to the right from rest, Item 0's left edge reads 48 px without the change and 30 px with it, where it sat at rest, at 3 s and again at 6 s.