Revert "Cleanup enableSyncDefaultUpdate flag (#26236)" (#26528)

This reverts commit b2ae9dd.

While the feature flag is fully rolled out, these tests are also testing
behavior set with an unstable flag on root, which for now we want to
preserve.

Not sure if there's a better way then adding a dynamic feature flag to
the www build?

DiffTrain build for [da94e8b](da94e8b)

compiled/facebook-www/REVISION

@@ -1 +1 @@
-4a1cc2ddd035f5c269e82ab6f7686e2e60d3b3ea
+da94e8b24a3f31a3e805f9bf6bba73055aad9d41

compiled/facebook-www/React-dev.modern.js

@@ -27,7 +27,7 @@ if (
 }
           "use strict";
 
-var ReactVersion = "18.3.0-www-modern-be9a0998";
+var ReactVersion = "18.3.0-www-modern-c754d90a";
 
 // ATTENTION
 // When adding new symbols to this file,

compiled/facebook-www/ReactART-dev.classic.js

@@ -69,7 +69,7 @@ function _assertThisInitialized(self) {
   return self;
 }
 
-var ReactVersion = "18.3.0-www-classic-ec4b0889";
+var ReactVersion = "18.3.0-www-classic-828157c0";
 
 var LegacyRoot = 0;
 var ConcurrentRoot = 1;
@@ -173,6 +173,7 @@ var revertRemovalOfSiblingPrerendering =
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableDeferRootSchedulingToMicrotask =
@@ -27698,7 +27699,9 @@ function createHostRootFiber(
     }
 
     if (
-      // Only for internal experiments.
+      // We only use this flag for our repo tests to check both behaviors.
+      // TODO: Flip this flag and rename it something like "forceConcurrentByDefaultForTesting"
+      !enableSyncDefaultUpdates || // Only for internal experiments.
       concurrentUpdatesByDefaultOverride
     ) {
       mode |= ConcurrentUpdatesByDefaultMode;

compiled/facebook-www/ReactART-dev.modern.js

@@ -69,7 +69,7 @@ function _assertThisInitialized(self) {
   return self;
 }
 
-var ReactVersion = "18.3.0-www-modern-ae3f1831";
+var ReactVersion = "18.3.0-www-modern-0165cfa3";
 
 var LegacyRoot = 0;
 var ConcurrentRoot = 1;
@@ -173,6 +173,7 @@ var revertRemovalOfSiblingPrerendering =
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableDeferRootSchedulingToMicrotask =
@@ -27358,7 +27359,9 @@ function createHostRootFiber(
     }
 
     if (
-      // Only for internal experiments.
+      // We only use this flag for our repo tests to check both behaviors.
+      // TODO: Flip this flag and rename it something like "forceConcurrentByDefaultForTesting"
+      !enableSyncDefaultUpdates || // Only for internal experiments.
       concurrentUpdatesByDefaultOverride
     ) {
       mode |= ConcurrentUpdatesByDefaultMode;

compiled/facebook-www/ReactART-prod.modern.js

@@ -9732,7 +9732,7 @@ var slice = Array.prototype.slice,
       return null;
     },
     bundleType: 0,
-    version: "18.3.0-www-modern-d98f8218",
+    version: "18.3.0-www-modern-bf67bce4",
     rendererPackageName: "react-art"
   };
 var internals$jscomp$inline_1324 = {
@@ -9763,7 +9763,7 @@ var internals$jscomp$inline_1324 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-modern-d98f8218"
+  reconcilerVersion: "18.3.0-www-modern-bf67bce4"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1325 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

compiled/facebook-www/ReactDOM-dev.classic.js

@@ -138,6 +138,7 @@ var disableInputAttributeSyncing =
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableCustomElementPropertySupport =
@@ -33338,7 +33339,9 @@ function createHostRootFiber(
     }
 
     if (
-      // Only for internal experiments.
+      // We only use this flag for our repo tests to check both behaviors.
+      // TODO: Flip this flag and rename it something like "forceConcurrentByDefaultForTesting"
+      !enableSyncDefaultUpdates || // Only for internal experiments.
       concurrentUpdatesByDefaultOverride
     ) {
       mode |= ConcurrentUpdatesByDefaultMode;
@@ -33893,7 +33896,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-classic-3e8e5cab";
+var ReactVersion = "18.3.0-www-classic-3f441887";
 
 function createPortal$1(
   children,

compiled/facebook-www/ReactDOM-dev.modern.js

@@ -255,6 +255,7 @@ var disableInputAttributeSyncing =
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableCustomElementPropertySupport =
@@ -33177,7 +33178,9 @@ function createHostRootFiber(
     }
 
     if (
-      // Only for internal experiments.
+      // We only use this flag for our repo tests to check both behaviors.
+      // TODO: Flip this flag and rename it something like "forceConcurrentByDefaultForTesting"
+      !enableSyncDefaultUpdates || // Only for internal experiments.
       concurrentUpdatesByDefaultOverride
     ) {
       mode |= ConcurrentUpdatesByDefaultMode;
@@ -33732,7 +33735,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-modern-d98f8218";
+var ReactVersion = "18.3.0-www-modern-bf67bce4";
 
 function createPortal$1(
   children,

compiled/facebook-www/ReactDOM-prod.classic.js

@@ -48,6 +48,7 @@ var ReactSharedInternals =
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableCustomElementPropertySupport =
@@ -11835,11 +11836,14 @@ function createFiberRoot(
   containerInfo.hydrationCallbacks = hydrationCallbacks;
   enableTransitionTracing &&
     (containerInfo.transitionCallbacks = transitionCallbacks);
-  1 === tag
-    ? ((tag = 1),
+  if (1 === tag) {
+    if (
+      ((tag = 1),
       !0 === isStrictMode && (tag |= 24),
-      concurrentUpdatesByDefaultOverride && (tag |= 32))
-    : (tag = 0);
+      !enableSyncDefaultUpdates || concurrentUpdatesByDefaultOverride)
+    )
+      tag |= 32;
+  } else tag = 0;
   isStrictMode = createFiber(3, null, null, tag);
   containerInfo.current = isStrictMode;
   isStrictMode.stateNode = containerInfo;
@@ -15966,7 +15970,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1812 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-classic-fec0aa60",
+  version: "18.3.0-www-classic-067cf99f",
   rendererPackageName: "react-dom"
 };
 var internals$jscomp$inline_2208 = {
@@ -15996,7 +16000,7 @@ var internals$jscomp$inline_2208 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-classic-fec0aa60"
+  reconcilerVersion: "18.3.0-www-classic-067cf99f"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_2209 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -16236,4 +16240,4 @@ exports.unstable_renderSubtreeIntoContainer = function (
   );
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-www-classic-fec0aa60";
+exports.version = "18.3.0-www-classic-067cf99f";

compiled/facebook-www/ReactDOM-prod.modern.js

@@ -105,6 +105,7 @@ var dynamicFeatureFlags = require("ReactFeatureFlags"),
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableCustomElementPropertySupport =
@@ -11635,11 +11636,14 @@ function createFiberRoot(
   containerInfo.hydrationCallbacks = hydrationCallbacks;
   enableTransitionTracing &&
     (containerInfo.transitionCallbacks = transitionCallbacks);
-  1 === tag
-    ? ((tag = 1),
+  if (1 === tag) {
+    if (
+      ((tag = 1),
       !0 === isStrictMode && (tag |= 24),
-      concurrentUpdatesByDefaultOverride && (tag |= 32))
-    : (tag = 0);
+      !enableSyncDefaultUpdates || concurrentUpdatesByDefaultOverride)
+    )
+      tag |= 32;
+  } else tag = 0;
   isStrictMode = createFiber(3, null, null, tag);
   containerInfo.current = isStrictMode;
   isStrictMode.stateNode = containerInfo;
@@ -15493,7 +15497,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1770 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-modern-e2caad0b",
+  version: "18.3.0-www-modern-1e3e94dc",
   rendererPackageName: "react-dom"
 };
 var internals$jscomp$inline_2171 = {
@@ -15524,7 +15528,7 @@ var internals$jscomp$inline_2171 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-modern-e2caad0b"
+  reconcilerVersion: "18.3.0-www-modern-1e3e94dc"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_2172 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -15693,4 +15697,4 @@ exports.unstable_createEventHandle = function (type, options) {
   return eventHandle;
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-www-modern-e2caad0b";
+exports.version = "18.3.0-www-modern-1e3e94dc";

compiled/facebook-www/ReactDOM-profiling.classic.js

@@ -59,6 +59,7 @@ var ReactSharedInternals =
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableCustomElementPropertySupport =
@@ -12603,11 +12604,14 @@ function createFiberRoot(
   containerInfo.hydrationCallbacks = hydrationCallbacks;
   enableTransitionTracing &&
     (containerInfo.transitionCallbacks = transitionCallbacks);
-  1 === tag
-    ? ((tag = 1),
+  if (1 === tag) {
+    if (
+      ((tag = 1),
       !0 === isStrictMode && (tag |= 24),
-      concurrentUpdatesByDefaultOverride && (tag |= 32))
-    : (tag = 0);
+      !enableSyncDefaultUpdates || concurrentUpdatesByDefaultOverride)
+    )
+      tag |= 32;
+  } else tag = 0;
   isDevToolsPresent && (tag |= 2);
   isStrictMode = createFiber(3, null, null, tag);
   containerInfo.current = isStrictMode;
@@ -16740,7 +16744,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1891 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-classic-a30ed13a",
+  version: "18.3.0-www-classic-03ed5162",
   rendererPackageName: "react-dom"
 };
 (function (internals) {
@@ -16784,7 +16788,7 @@ var devToolsConfig$jscomp$inline_1891 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-classic-a30ed13a"
+  reconcilerVersion: "18.3.0-www-classic-03ed5162"
 });
 assign(Internals, {
   ReactBrowserEventEmitter: {
@@ -17011,7 +17015,7 @@ exports.unstable_renderSubtreeIntoContainer = function (
   );
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-www-classic-a30ed13a";
+exports.version = "18.3.0-www-classic-03ed5162";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (

compiled/facebook-www/ReactDOM-profiling.modern.js

@@ -116,6 +116,7 @@ var dynamicFeatureFlags = require("ReactFeatureFlags"),
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableCustomElementPropertySupport =
@@ -12397,11 +12398,14 @@ function createFiberRoot(
   containerInfo.hydrationCallbacks = hydrationCallbacks;
   enableTransitionTracing &&
     (containerInfo.transitionCallbacks = transitionCallbacks);
-  1 === tag
-    ? ((tag = 1),
+  if (1 === tag) {
+    if (
+      ((tag = 1),
       !0 === isStrictMode && (tag |= 24),
-      concurrentUpdatesByDefaultOverride && (tag |= 32))
-    : (tag = 0);
+      !enableSyncDefaultUpdates || concurrentUpdatesByDefaultOverride)
+    )
+      tag |= 32;
+  } else tag = 0;
   isDevToolsPresent && (tag |= 2);
   isStrictMode = createFiber(3, null, null, tag);
   containerInfo.current = isStrictMode;
@@ -16261,7 +16265,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1849 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-modern-f4c1fdba",
+  version: "18.3.0-www-modern-2e9b50ad",
   rendererPackageName: "react-dom"
 };
 (function (internals) {
@@ -16306,7 +16310,7 @@ var devToolsConfig$jscomp$inline_1849 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-modern-f4c1fdba"
+  reconcilerVersion: "18.3.0-www-modern-2e9b50ad"
 });
 exports.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED = Internals;
 exports.createPortal = function (children, container) {
@@ -16462,7 +16466,7 @@ exports.unstable_createEventHandle = function (type, options) {
   return eventHandle;
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-www-modern-f4c1fdba";
+exports.version = "18.3.0-www-modern-2e9b50ad";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (

compiled/facebook-www/ReactDOMTesting-dev.classic.js

@@ -127,6 +127,7 @@ var disableInputAttributeSyncing =
   enableUseRefAccessWarning = dynamicFeatureFlags.enableUseRefAccessWarning,
   enableLazyContextPropagation =
     dynamicFeatureFlags.enableLazyContextPropagation,
+  enableSyncDefaultUpdates = dynamicFeatureFlags.enableSyncDefaultUpdates,
   enableUnifiedSyncLane = dynamicFeatureFlags.enableUnifiedSyncLane,
   enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
   enableCustomElementPropertySupport =
@@ -35392,7 +35393,9 @@ function createHostRootFiber(
     }
 
     if (
-      // Only for internal experiments.
+      // We only use this flag for our repo tests to check both behaviors.
+      // TODO: Flip this flag and rename it something like "forceConcurrentByDefaultForTesting"
+      !enableSyncDefaultUpdates || // Only for internal experiments.
       concurrentUpdatesByDefaultOverride
     ) {
       mode |= ConcurrentUpdatesByDefaultMode;
@@ -35947,7 +35950,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-classic-9a1ec795";
+var ReactVersion = "18.3.0-www-classic-a8de269b";
 
 function createPortal$1(
   children,