fix(runtime-core): to changes during teleport disabled cause update error

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

@@ -475,4 +475,57 @@ describe('renderer: teleport', () => {
     expect(dir.mounted).toHaveBeenCalledTimes(1)
     expect(dir.unmounted).toHaveBeenCalledTimes(1)
   })
+
+  // #7835
+  test(`ensure that target changes when disabled are updated correctly when enabled`, async () => {
+    const root = nodeOps.createElement('div')
+    const target1 = nodeOps.createElement('div')
+    const target2 = nodeOps.createElement('div')
+    const target3 = nodeOps.createElement('div')
+    const target = ref(target1)
+    const disabled = ref(true)
+
+    const App = {
+      setup() {
+        return () =>
+          h(Fragment, [
+            h(
+              Teleport,
+              { to: target.value, disabled: disabled.value },
+              h('div', 'teleported')
+            )
+          ])
+      }
+    }
+    render(h(App), root)
+    disabled.value = false
+    await nextTick()
+    expect(serializeInner(target1)).toMatchInlineSnapshot(
+      `"<div>teleported</div>"`
+    )
+    expect(serializeInner(target2)).toMatchInlineSnapshot(`""`)
+    expect(serializeInner(target3)).toMatchInlineSnapshot(`""`)
+
+    disabled.value = true
+    await nextTick()
+    target.value = target2
+    await nextTick()
+    expect(serializeInner(target1)).toMatchInlineSnapshot(`""`)
+    expect(serializeInner(target2)).toMatchInlineSnapshot(`""`)
+    expect(serializeInner(target3)).toMatchInlineSnapshot(`""`)
+
+    target.value = target3
+    await nextTick()
+    expect(serializeInner(target1)).toMatchInlineSnapshot(`""`)
+    expect(serializeInner(target2)).toMatchInlineSnapshot(`""`)
+    expect(serializeInner(target3)).toMatchInlineSnapshot(`""`)
+
+    disabled.value = false
+    await nextTick()
+    expect(serializeInner(target1)).toMatchInlineSnapshot(`""`)
+    expect(serializeInner(target2)).toMatchInlineSnapshot(`""`)
+    expect(serializeInner(target3)).toMatchInlineSnapshot(
+      `"<div>teleported</div>"`
+    )
+  })
 })

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

@@ -186,6 +186,13 @@ export const TeleportImpl = {
             internals,
             TeleportMoveTypes.TOGGLE
           )
+        } else {
+          // #7835
+          // When `teleport` is disabled, `to` may change, making it always old,
+          // to ensure the correct `to` when enabled
+          if (n2.props && n1.props && n2.props.to !== n1.props.to) {
+            n2.props.to = n1.props.to
+          }
         }
       } else {
         // target changed