should invoke destroy hook for replaced root nodes too

src/core/vdom/patch.js

@@ -383,6 +383,8 @@ export function createPatchFunction (backend) {
         if (parent !== null) {
           nodeOps.insertBefore(parent, vnode.elm, nodeOps.nextSibling(elm))
           removeVnodes(parent, [oldVnode], 0, 0)
+        } else if (isDef(oldVnode.tag)) {
+          invokeDestroyHook(oldVnode)
         }
       }
     }

test/unit/modules/vdom/patch/hooks.spec.js

@@ -244,9 +244,10 @@ describe('hooks', () => {
     ])
     const vnode2 = new VNode('div')
     patch1(vnode0, vnode1)
+    expect(destroyed).toBe(1) // should invoke for replaced root nodes too
     patch1(vnode1, vnode2)
     expect(created).toBe(5)
-    expect(destroyed).toBe(4)
+    expect(destroyed).toBe(5)
   })
 
   it('should not invoke `create` and `remove` module hook for text nodes', () => {
@@ -293,9 +294,10 @@ describe('hooks', () => {
     ])
     const vnode2 = new VNode('div')
     patch1(vnode0, vnode1)
+    expect(destroyed).toBe(1) // should invoke for replaced root nodes too
     patch1(vnode1, vnode2)
     expect(created).toBe(5)
-    expect(destroyed).toBe(4)
+    expect(destroyed).toBe(5)
   })
 
   it('should call `create` listener before inserted into parent but after children', () => {