Revert "feat(compiler-core): hoist element with static ref (#344)"

Static refs still need to be tracked in dynamicChildren because unmount
also takes the fast path when dynamicChildren is present, and all refs
need to be properly unmounted.

This reverts commit 920773fc6b.

packages/compiler-core/__tests__/transforms/__snapshots__/hoistStatic.spec.ts.snap

@@ -169,23 +169,6 @@ return function render() {
 }"
 `;
 
-exports[`compiler: hoistStatic transform prefixIdentifiers hoist element with static ref 1`] = `
-"const _Vue = Vue
-const _createVNode = Vue.createVNode
-
-const _hoisted_1 = _createVNode(\\"span\\", { ref: \\"o\\" })
-
-return function render() {
-  with (this) {
-    const { createVNode: _createVNode, createBlock: _createBlock, openBlock: _openBlock } = _Vue
-    
-    return (_openBlock(), _createBlock(\\"div\\", null, [
-      _hoisted_1
-    ]))
-  }
-}"
-`;
-
 exports[`compiler: hoistStatic transform prefixIdentifiers hoist nested static tree with static interpolation 1`] = `
 "const _Vue = Vue
 const _createVNode = Vue.createVNode

packages/compiler-core/__tests__/transforms/hoistStatic.spec.ts

@@ -677,42 +677,5 @@ describe('compiler: hoistStatic transform', () => {
         }).code
       ).toMatchSnapshot()
     })
-
-    test('hoist element with static ref', () => {
-      const { root, args } = transformWithHoist(
-        `<div><span ref="o"></span></div>`,
-        {
-          prefixIdentifiers: true
-        }
-      )
-
-      expect(root.hoists.length).toBe(1)
-      expect(root.hoists).toMatchObject([
-        {
-          type: NodeTypes.JS_CALL_EXPRESSION,
-          callee: CREATE_VNODE,
-          arguments: [
-            `"span"`,
-            createObjectMatcher({
-              ref: `o`
-            })
-          ]
-        }
-      ])
-      expect(args).toMatchObject([
-        `"div"`,
-        `null`,
-        [
-          {
-            type: NodeTypes.ELEMENT,
-            codegenNode: {
-              type: NodeTypes.SIMPLE_EXPRESSION,
-              content: `_hoisted_1`
-            }
-          }
-        ]
-      ])
-      expect(generate(root).code).toMatchSnapshot()
-    })
   })
 })

packages/compiler-core/__tests__/transforms/transformElement.spec.ts

@@ -699,15 +699,10 @@ describe('compiler: element transform', () => {
       expect(node.arguments[3]).toBe(genFlagText(PatchFlags.FULL_PROPS))
     })
 
-    test('NO NEED_PATCH (static ref)', () => {
+    test('NEED_PATCH (static ref)', () => {
       const { node } = parseWithBind(`<div ref="foo" />`)
-      expect(node.arguments.length).toBe(2)
-      expect(node.arguments).toMatchObject([
-        `"div"`,
-        createObjectMatcher({
-          ref: `foo`
-        })
-      ])
+      expect(node.arguments.length).toBe(4)
+      expect(node.arguments[3]).toBe(genFlagText(PatchFlags.NEED_PATCH))
     })
 
     test('NEED_PATCH (dynamic ref)', () => {

packages/compiler-core/src/transforms/transformElement.ts

@@ -249,6 +249,9 @@ export function buildProps(
     const prop = props[i]
     if (prop.type === NodeTypes.ATTRIBUTE) {
       const { loc, name, value } = prop
+      if (name === 'ref') {
+        hasRef = true
+      }
       properties.push(
         createObjectProperty(
           createSimpleExpression(