fix(android): skip Reanimated sync prop updates for unmounted views (#7907)

Backport of software-mansion/react-native-reanimated#10435 (shipped in Reanimated 4.7.1) to the 4.5.1 that Expo 57 pins. On React Native 0.86 Reanimated applies synchronous prop updates by reflection and skips the view-existence guard, so every view tag that unmounted with buffered updates threw RetryableMountingLayerException on each event dispatch and printed a full stack on the UI thread. The guard checks MountingManager.getViewExists first and skips writes to missing native views.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
(cherry picked from commit ff31b6e5b9)

patches/react-native-reanimated+4.5.1.patch

@@ -0,0 +1,35 @@
+diff --git a/node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/NativeProxy.kt b/node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/NativeProxy.kt
+index 48e3771..0fba1af 100644
+--- a/node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/NativeProxy.kt
++++ b/node_modules/react-native-reanimated/android/src/main/java/com/swmansion/reanimated/NativeProxy.kt
+@@ -245,6 +245,15 @@ open class NativeProxy {
+             }.apply { isAccessible = true }
+     }
+ 
++    // Backport of https://github.com/software-mansion/react-native-reanimated/pull/10435
++    // (shipped in Reanimated 4.7.1). The reflective updatePropsSynchronously path skips RN's
++    // view-existence guard, so a tag that unmounted with buffered updates throws
++    // RetryableMountingLayerException on every event dispatch and Log.w printed the full stack
++    // on the UI thread inside the draw pass. Remove once the installed Reanimated includes the fix.
++    private val getViewExistsMethod by lazy {
++        runCatching { mountingManager.javaClass.getMethod("getViewExists", Int::class.javaPrimitiveType) }.getOrNull()
++    }
++
+     @DoNotStrip
+     fun synchronouslyUpdateUIProps(
+         intBuffer: IntArray,
+@@ -253,9 +262,13 @@ open class NativeProxy {
+         SynchronousPropsBufferParser.parse(intBuffer, doubleBuffer) { viewTag, props ->
+             if (BuildConfig.IS_REACT_NATIVE_86_OR_NEWER) {
+                 try {
++                    // The props stay in the registry, and the commit hook applies them to the shadow tree.
++                    if (getViewExistsMethod?.invoke(mountingManager, viewTag) == false) {
++                        return@parse
++                    }
+                     updatePropsSynchronouslyMethod.invoke(mountingManager, viewTag, props)
+                 } catch (e: Exception) {
+-                    Log.w("Reanimated", "synchronouslyUpdateUIProps failed for tag $viewTag", e)
++                    Log.w("Reanimated", "synchronouslyUpdateUIProps failed for tag $viewTag: ${e.cause ?: e}")
+                 }
+             } else {
+                 mFabricUIManager.synchronouslyUpdateViewOnUIThread(viewTag, props)

scripts/postinstall-patches.mjs

@@ -25,6 +25,14 @@ const patchedPackages = [
     nodeModulesPath: "node_modules/react-native-unistyles",
     patchPrefix: "react-native-unistyles+",
   },
+  // Backport of https://github.com/software-mansion/react-native-reanimated/pull/10435
+  // (Reanimated 4.7.1): skip synchronous Android prop updates for unmounted view tags
+  // instead of throwing and printing a full stack trace on the UI thread per tag per event.
+  // Remove when the installed Reanimated is >= 4.7.1.
+  {
+    nodeModulesPath: "node_modules/react-native-reanimated",
+    patchPrefix: "react-native-reanimated+",
+  },
   {
     nodeModulesPath: "node_modules/react-native-draggable-flatlist",
     patchPrefix: "react-native-draggable-flatlist+",