Restore nested ScrollView manager generation parity

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/LengthPercentage.kt

@@ -51,6 +51,7 @@ public data class LengthPercentage(
             null
           }
         }
+        ReadableType.Null -> null
         else -> {
           FLog.w(ReactConstants.TAG, "Unsupported type for radius property: ${dynamic.type}")
           null

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactNestedScrollViewManager.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<3b339a7d81f8e32cf6b6ca93ae9a388b>>
+ * @generated SignedSource<<acbc1716191446a5c496c66dfa368b52>>
  */
 
 /**
@@ -461,15 +461,17 @@ constructor(private val fpsListener: FpsListener? = null) :
   companion object {
     const val REACT_CLASS: String = "RCTScrollView"
 
-    fun createExportedCustomDirectEventTypeConstants(): Map<String, Any> = mapOf(
-        getJSEventName(ScrollEventType.SCROLL) to mapOf("registrationName" to "onScroll"),
-        getJSEventName(ScrollEventType.BEGIN_DRAG) to
-            mapOf("registrationName" to "onScrollBeginDrag"),
-        getJSEventName(ScrollEventType.END_DRAG) to mapOf("registrationName" to "onScrollEndDrag"),
-        getJSEventName(ScrollEventType.MOMENTUM_BEGIN) to
-            mapOf("registrationName" to "onMomentumScrollBegin"),
-        getJSEventName(ScrollEventType.MOMENTUM_END) to
-            mapOf("registrationName" to "onMomentumScrollEnd"),
-    )
+    fun createExportedCustomDirectEventTypeConstants(): Map<String, Any> =
+        mapOf(
+            getJSEventName(ScrollEventType.SCROLL) to mapOf("registrationName" to "onScroll"),
+            getJSEventName(ScrollEventType.BEGIN_DRAG) to
+                mapOf("registrationName" to "onScrollBeginDrag"),
+            getJSEventName(ScrollEventType.END_DRAG) to
+                mapOf("registrationName" to "onScrollEndDrag"),
+            getJSEventName(ScrollEventType.MOMENTUM_BEGIN) to
+                mapOf("registrationName" to "onMomentumScrollBegin"),
+            getJSEventName(ScrollEventType.MOMENTUM_END) to
+                mapOf("registrationName" to "onMomentumScrollEnd"),
+        )
   }
 }

packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/LengthPercentageTest.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.uimanager
+
+import com.facebook.common.logging.FLog
+import com.facebook.react.bridge.DynamicFromObject
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Test
+import org.mockito.Mockito.mockStatic
+
+class LengthPercentageTest {
+
+  @Test
+  fun parsesPointAndPercentageValues() {
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(12.0)))
+        .isEqualTo(LengthPercentage(12f, LengthPercentageType.POINT))
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject("25%")))
+        .isEqualTo(LengthPercentage(25f, LengthPercentageType.PERCENT))
+  }
+
+  @Test
+  fun rejectsNegativeValuesByDefault() {
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(-1.0))).isNull()
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject("-1%"))).isNull()
+  }
+
+  @Test
+  fun acceptsNegativeValuesWhenAllowed() {
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(-1.0), allowNegative = true))
+        .isEqualTo(LengthPercentage(-1f, LengthPercentageType.POINT))
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject("-1%"), allowNegative = true))
+        .isEqualTo(LengthPercentage(-1f, LengthPercentageType.PERCENT))
+  }
+
+  @Test
+  fun clearsNullWithoutWarning() {
+    mockStatic(FLog::class.java).use { flog ->
+      assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(null))).isNull()
+      flog.verifyNoInteractions()
+    }
+  }
+}