refactor(hmr): simplify hmr force update check

packages/runtime-core/src/componentSlots.ts

@@ -18,7 +18,7 @@ import {
 import { warn } from './warning'
 import { isKeepAlive } from './components/KeepAlive'
 import { withCtx } from './helpers/withRenderContext'
-import { queuePostFlushCb } from './scheduler'
+import { isHmrUpdating } from './hmr'
 
 export type Slot = (...args: any[]) => VNode[]
 
@@ -125,14 +125,10 @@ export const updateSlots = (
   if (vnode.shapeFlag & ShapeFlags.SLOTS_CHILDREN) {
     if ((children as RawSlots)._ === 1) {
       // compiled slots.
-      if (__DEV__ && instance.parent && instance.parent.hmrUpdated) {
+      if (__DEV__ && isHmrUpdating) {
         // Parent was HMR updated so slot content may have changed.
         // force update slots and mark instance for hmr as well
         extend(slots, children as Slots)
-        instance.hmrUpdated = true
-        queuePostFlushCb(() => {
-          instance.hmrUpdated = false
-        })
       } else if (
         // bail on dynamic slots (v-if, v-for, reference of scope variables)
         !(vnode.patchFlag & PatchFlags.DYNAMIC_SLOTS)