fix(teleport): only inherit el for non-patched nodes

fix #1903

packages/runtime-core/__tests__/components/Teleport.spec.ts

@@ -316,7 +316,7 @@ describe('renderer: teleport', () => {
       },
       render: compile(`
       <teleport :to="target" :disabled="disabled">
-        <div>teleported</div><span>{{ disabled }}</span>
+        <div>teleported</div><span>{{ disabled }}</span><span v-if="disabled"/>
       </teleport>
       <div>root</div>
       `)
@@ -326,13 +326,13 @@ describe('renderer: teleport', () => {
       `"<!--teleport start--><!--teleport end--><div>root</div>"`
     )
     expect(serializeInner(target)).toMatchInlineSnapshot(
-      `"<div>teleported</div><span>false</span>"`
+      `"<div>teleported</div><span>false</span><!--v-if-->"`
     )
 
     disabled.value = true
     await nextTick()
     expect(serializeInner(root)).toMatchInlineSnapshot(
-      `"<!--teleport start--><div>teleported</div><span>true</span><!--teleport end--><div>root</div>"`
+      `"<!--teleport start--><div>teleported</div><span>true</span><span></span><!--teleport end--><div>root</div>"`
     )
     expect(serializeInner(target)).toBe(``)
 
@@ -343,7 +343,7 @@ describe('renderer: teleport', () => {
       `"<!--teleport start--><!--teleport end--><div>root</div>"`
     )
     expect(serializeInner(target)).toMatchInlineSnapshot(
-      `"<div>teleported</div><span>false</span>"`
+      `"<div>teleported</div><span>false</span><!--v-if-->"`
     )
   })
 })

packages/runtime-core/src/components/Teleport.ts

@@ -146,7 +146,10 @@ export const TeleportImpl = {
           const oldChildren = n1.children as VNode[]
           const children = n2.children as VNode[]
           for (let i = 0; i < children.length; i++) {
-            children[i].el = oldChildren[i].el
+            // only inherit for non-patched nodes (i.e. static ones)
+            if (!children[i].el) {
+              children[i].el = oldChildren[i].el
+            }
           }
         }
       } else if (!optimized) {