fix: only unregister/register components when not hot updating in shimmed unbuild function

Author: yyx990803

lib/hot-reload-api.js

@@ -41,12 +41,14 @@ exports.install = function (Vue) {
 
 function shimComponent (dir, map) {
   shimMethod(dir, 'unbuild', function (defer) {
-    var prevComponent = this.childVM && this.childVM.constructor
-    removeComponent(prevComponent, map, this)
-    // defer = true means we are transitioning to a new
-    // Component. Register this new component to the list.
-    if (defer) {
-      addComponent(this.Component, map, this)
+    if (!this.hotUpdating) {
+      var prevComponent = this.childVM && this.childVM.constructor
+      removeComponent(prevComponent, map, this)
+      // defer = true means we are transitioning to a new
+      // Component. Register this new component to the list.
+      if (defer) {
+        addComponent(this.Component, map, this)
+      }
     }
   })
 }
@@ -113,6 +115,7 @@ exports.update = function (view) {
   if (!view._bound) {
     return
   }
+  view.hotUpdating = true
   // disable transitions
   view.vm._isCompiled = false
   // save state
@@ -126,4 +129,5 @@ exports.update = function (view) {
   view.childVM.$data = state
   // re-eanble transitions
   view.vm._isCompiled = true
+  view.hotUpdating = false
 }