[Re-land] Make prerendering always non-blocking: Add missing feature flag checks

packages/react-reconciler/src/ReactFiberCompleteWork.js

@@ -42,6 +42,7 @@ import {
   enableRenderableContext,
   passChildrenWhenCloningPersistedNodes,
   disableLegacyMode,
+  enableSiblingPrerendering,
 } from 'shared/ReactFeatureFlags';
 
 import {now} from './Scheduler';
@@ -622,7 +623,9 @@ function scheduleRetryEffect(
 
     // Track the lanes that have been scheduled for an immediate retry so that
     // we can mark them as suspended upon committing the root.
-    markSpawnedRetryLane(retryLane);
+    if (enableSiblingPrerendering) {
+      markSpawnedRetryLane(retryLane);
+    }
   }
 }
 

packages/react-reconciler/src/ReactFiberLane.js

@@ -27,6 +27,7 @@ import {
   transitionLaneExpirationMs,
   retryLaneExpirationMs,
   disableLegacyMode,
+  enableSiblingPrerendering,
 } from 'shared/ReactFeatureFlags';
 import {isDevToolsPresent} from './ReactFiberDevToolsHook';
 import {clz32} from './clz32';
@@ -270,11 +271,13 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
       if (nonIdlePingedLanes !== NoLanes) {
         nextLanes = getHighestPriorityLanes(nonIdlePingedLanes);
       } else {
-        // Nothing has been pinged. Check for lanes that need to be prewarmed.
-        if (!rootHasPendingCommit) {
-          const lanesToPrewarm = nonIdlePendingLanes & ~warmLanes;
-          if (lanesToPrewarm !== NoLanes) {
-            nextLanes = getHighestPriorityLanes(lanesToPrewarm);
+        if (enableSiblingPrerendering) {
+          // Nothing has been pinged. Check for lanes that need to be prewarmed.
+          if (!rootHasPendingCommit) {
+            const lanesToPrewarm = nonIdlePendingLanes & ~warmLanes;
+            if (lanesToPrewarm !== NoLanes) {
+              nextLanes = getHighestPriorityLanes(lanesToPrewarm);
+            }
           }
         }
       }
@@ -294,11 +297,13 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
       if (pingedLanes !== NoLanes) {
         nextLanes = getHighestPriorityLanes(pingedLanes);
       } else {
-        // Nothing has been pinged. Check for lanes that need to be prewarmed.
-        if (!rootHasPendingCommit) {
-          const lanesToPrewarm = pendingLanes & ~warmLanes;
-          if (lanesToPrewarm !== NoLanes) {
-            nextLanes = getHighestPriorityLanes(lanesToPrewarm);
+        if (enableSiblingPrerendering) {
+          // Nothing has been pinged. Check for lanes that need to be prewarmed.
+          if (!rootHasPendingCommit) {
+            const lanesToPrewarm = pendingLanes & ~warmLanes;
+            if (lanesToPrewarm !== NoLanes) {
+              nextLanes = getHighestPriorityLanes(lanesToPrewarm);
+            }
           }
         }
       }
@@ -765,7 +770,7 @@ export function markRootSuspended(
   root.suspendedLanes |= suspendedLanes;
   root.pingedLanes &= ~suspendedLanes;
 
-  if (!didSkipSuspendedSiblings) {
+  if (enableSiblingPrerendering && !didSkipSuspendedSiblings) {
     // Mark these lanes as warm so we know there's nothing else to work on.
     root.warmLanes |= suspendedLanes;
   } else {
@@ -876,6 +881,7 @@ export function markRootFinished(
   // suspended) instead of the regular mode (i.e. unwind and skip the siblings
   // as soon as something suspends to unblock the rest of the update).
   if (
+    enableSiblingPrerendering &&
     suspendedRetryLanes !== NoLanes &&
     // Note that we only do this if there were no updates since we started
     // rendering. This mirrors the logic in markRootUpdated — whenever we