fix(runtime-core): should not track dynamic children when the user calls a compiled slot inside template expression (#3554)

fix #3548, partial fix for #3569

packages/runtime-core/src/vnode.ts

@@ -40,7 +40,6 @@ import {
 import { RendererNode, RendererElement } from './renderer'
 import { NULL_DYNAMIC_COMPONENT } from './helpers/resolveAssets'
 import { hmrDirtyComponents } from './hmr'
-import { setCompiledSlotRendering } from './helpers/renderSlot'
 import { convertLegacyComponent } from './compat/component'
 import { convertLegacyVModelProps } from './compat/componentVModel'
 import { defineLegacyVNodeProperties } from './compat/renderFn'
@@ -218,7 +217,7 @@ export function closeBlock() {
 // Only tracks when this value is > 0
 // We are not using a simple boolean because this value may need to be
 // incremented/decremented by nested usage of v-once (see below)
-let shouldTrack = 1
+let isBlockTreeEnabled = 1
 
 /**
  * Block tracking sometimes needs to be disabled, for example during the
@@ -237,7 +236,7 @@ let shouldTrack = 1
  * @private
  */
 export function setBlockTracking(value: number) {
-  shouldTrack += value
+  isBlockTreeEnabled += value
 }
 
 /**
@@ -263,12 +262,13 @@ export function createBlock(
     true /* isBlock: prevent a block from tracking itself */
   )
   // save current block children on the block vnode
-  vnode.dynamicChildren = currentBlock || (EMPTY_ARR as any)
+  vnode.dynamicChildren =
+    isBlockTreeEnabled > 0 ? currentBlock || (EMPTY_ARR as any) : null
   // close block
   closeBlock()
   // a block is always going to be patched, so track it as a child of its
   // parent block
-  if (shouldTrack > 0 && currentBlock) {
+  if (isBlockTreeEnabled > 0 && currentBlock) {
     currentBlock.push(vnode)
   }
   return vnode
@@ -458,7 +458,7 @@ function _createVNode(
   }
 
   if (
-    shouldTrack > 0 &&
+    isBlockTreeEnabled > 0 &&
     // avoid a block node from tracking itself
     !isBlockNode &&
     // has current parent block
@@ -635,9 +635,9 @@ export function normalizeChildren(vnode: VNode, children: unknown) {
       const slot = (children as any).default
       if (slot) {
         // _c marker is added by withCtx() indicating this is a compiled slot
-        slot._c && setCompiledSlotRendering(1)
+        slot._c && (slot._d = false)
         normalizeChildren(vnode, slot())
-        slot._c && setCompiledSlotRendering(-1)
+        slot._c && (slot._d = true)
       }
       return
     } else {