Reset the event name to "" if we're doing more than one render within…

… the event

We do this by applying the clamp lazily and not resetting the event info between renders.

packages/react-reconciler/src/ReactFiberPerformanceTrack.js

@@ -104,6 +104,7 @@ export function logBlockingStart(
   updateTime: number,
   eventTime: number,
   eventType: null | string,
+  eventIsRepeat: boolean,
   renderStartTime: number,
 ): void {
   if (supportsUserTiming) {
@@ -114,7 +115,10 @@ export function logBlockingStart(
       reusableComponentOptions.start = eventTime;
       reusableComponentOptions.end =
         updateTime > 0 ? updateTime : renderStartTime;
-      performance.measure(eventType, reusableComponentOptions);
+      performance.measure(
+        eventIsRepeat ? '' : eventType,
+        reusableComponentOptions,
+      );
     }
     if (updateTime > 0) {
       // Log the time from when we called setState until we started rendering.
@@ -131,6 +135,7 @@ export function logTransitionStart(
   updateTime: number,
   eventTime: number,
   eventType: null | string,
+  eventIsRepeat: boolean,
   renderStartTime: number,
 ): void {
   if (supportsUserTiming) {
@@ -145,7 +150,10 @@ export function logTransitionStart(
           : updateTime > 0
             ? updateTime
             : renderStartTime;
-      performance.measure(eventType, reusableComponentOptions);
+      performance.measure(
+        eventIsRepeat ? '' : eventType,
+        reusableComponentOptions,
+      );
     }
     if (startTime > 0) {
       // Log the time from when we started an async transition until we called setState or started rendering.

packages/react-reconciler/src/ReactFiberWorkLoop.js

@@ -229,13 +229,17 @@ import {
 } from './ReactFiberConcurrentUpdates';
 
 import {
+  blockingClampTime,
   blockingUpdateTime,
   blockingEventTime,
   blockingEventType,
+  blockingEventIsRepeat,
+  transitionClampTime,
   transitionStartTime,
   transitionUpdateTime,
   transitionEventTime,
   transitionEventType,
+  transitionEventIsRepeat,
   clearBlockingTimers,
   clearTransitionTimers,
   clampBlockingTimers,
@@ -1661,19 +1665,31 @@ function prepareFreshStack(root: FiberRoot, lanes: Lanes): Fiber {
 
     if (includesSyncLane(lanes) || includesBlockingLane(lanes)) {
       logBlockingStart(
-        blockingUpdateTime,
-        blockingEventTime,
+        blockingUpdateTime >= 0 && blockingUpdateTime < blockingClampTime
+          ? blockingClampTime
+          : blockingUpdateTime,
+        blockingEventTime >= 0 && blockingEventTime < blockingClampTime
+          ? blockingClampTime
+          : blockingEventTime,
         blockingEventType,
+        blockingEventIsRepeat,
         renderStartTime,
       );
       clearBlockingTimers();
     }
     if (includesTransitionLane(lanes)) {
       logTransitionStart(
-        transitionStartTime,
-        transitionUpdateTime,
-        transitionEventTime,
+        transitionStartTime >= 0 && transitionStartTime < transitionClampTime
+          ? transitionClampTime
+          : transitionStartTime,
+        transitionUpdateTime >= 0 && transitionUpdateTime < transitionClampTime
+          ? transitionClampTime
+          : transitionUpdateTime,
+        transitionEventTime >= 0 && transitionEventTime < transitionClampTime
+          ? transitionClampTime
+          : transitionEventTime,
         transitionEventType,
+        transitionEventIsRepeat,
         renderStartTime,
       );
       clearTransitionTimers();

packages/react-reconciler/src/ReactProfilerTimer.js

@@ -36,16 +36,18 @@ export let componentEffectDuration: number = -0;
 export let componentEffectStartTime: number = -1.1;
 export let componentEffectEndTime: number = -1.1;
 
-let blockingClampTime: number = -0;
+export let blockingClampTime: number = -0;
 export let blockingUpdateTime: number = -1.1; // First sync setState scheduled.
 export let blockingEventTime: number = -1.1; // Event timeStamp of the first setState.
 export let blockingEventType: null | string = null; // Event type of the first setState.
+export let blockingEventIsRepeat: boolean = false;
 // TODO: This should really be one per Transition lane.
-let transitionClampTime: number = -0;
+export let transitionClampTime: number = -0;
 export let transitionStartTime: number = -1.1; // First startTransition call before setState.
 export let transitionUpdateTime: number = -1.1; // First transition setState scheduled.
 export let transitionEventTime: number = -1.1; // Event timeStamp of the first transition.
 export let transitionEventType: null | string = null; // Event type of the first transition.
+export let transitionEventIsRepeat: boolean = false;
 
 export function startUpdateTimerByLane(lane: Lane): void {
   if (!enableProfilerTimer || !enableComponentPerformanceTrack) {
@@ -54,25 +56,25 @@ export function startUpdateTimerByLane(lane: Lane): void {
   if (isSyncLane(lane) || isBlockingLane(lane)) {
     if (blockingUpdateTime < 0) {
       blockingUpdateTime = now();
-      blockingEventTime = resolveEventTimeStamp();
-      blockingEventType = resolveEventType();
-      if (blockingEventTime < blockingClampTime) {
-        // We've already rendered within this event and we need to clamp the new update
-        // to the end of that render.
-        blockingEventTime = blockingClampTime;
-      }
+      const newEventTime = resolveEventTimeStamp();
+      const newEventType = resolveEventType();
+      blockingEventIsRepeat =
+        newEventTime === blockingEventTime &&
+        newEventType === blockingEventType;
+      blockingEventTime = newEventTime;
+      blockingEventType = newEventType;
     }
   } else if (isTransitionLane(lane)) {
     if (transitionUpdateTime < 0) {
       transitionUpdateTime = now();
       if (transitionStartTime < 0) {
-        transitionEventTime = resolveEventTimeStamp();
-        transitionEventType = resolveEventType();
-        if (transitionEventTime < transitionClampTime) {
-          // We've already rendered within this event and we need to clamp the new update
-          // to the end of that render.
-          transitionEventTime = transitionClampTime;
-        }
+        const newEventTime = resolveEventTimeStamp();
+        const newEventType = resolveEventType();
+        transitionEventIsRepeat =
+          newEventTime === transitionEventTime &&
+          newEventType === transitionEventType;
+        transitionEventTime = newEventTime;
+        transitionEventType = newEventType;
       }
     }
   }
@@ -88,13 +90,13 @@ export function startAsyncTransitionTimer(): void {
   }
   if (transitionStartTime < 0 && transitionUpdateTime < 0) {
     transitionStartTime = now();
-    transitionEventTime = resolveEventTimeStamp();
-    transitionEventType = resolveEventType();
-    if (transitionEventTime < transitionClampTime) {
-      // We've already rendered within this event and we need to clamp the new update
-      // to the end of that render.
-      transitionEventTime = transitionClampTime;
-    }
+    const newEventTime = resolveEventTimeStamp();
+    const newEventType = resolveEventType();
+    transitionEventIsRepeat =
+      newEventTime === transitionEventTime &&
+      newEventType === transitionEventType;
+    transitionEventTime = newEventTime;
+    transitionEventType = newEventType;
   }
 }
 
@@ -132,13 +134,6 @@ export function clampBlockingTimers(finalTime: number): void {
   // If we had new updates come in while we were still rendering or committing, we don't want
   // those update times to create overlapping tracks in the performance timeline so we clamp
   // them to the end of the commit phase.
-  if (blockingUpdateTime >= 0 && blockingUpdateTime < finalTime) {
-    blockingUpdateTime = finalTime;
-  }
-  if (blockingEventTime >= 0 && blockingEventTime < finalTime) {
-    blockingEventTime = finalTime;
-  }
-  // Save this for later in case another update comes in later with an early event time.
   blockingClampTime = finalTime;
 }
 
@@ -149,16 +144,6 @@ export function clampTransitionTimers(finalTime: number): void {
   // If we had new updates come in while we were still rendering or committing, we don't want
   // those update times to create overlapping tracks in the performance timeline so we clamp
   // them to the end of the commit phase.
-  if (transitionStartTime >= 0 && transitionStartTime < finalTime) {
-    transitionStartTime = finalTime;
-  }
-  if (transitionUpdateTime >= 0 && transitionUpdateTime < finalTime) {
-    transitionUpdateTime = finalTime;
-  }
-  if (transitionEventTime >= 0 && transitionEventTime < finalTime) {
-    transitionEventTime = finalTime;
-  }
-  // Save this for later in case another update comes in later with an early event time.
   transitionClampTime = finalTime;
 }