Merge pull request #5486 from i7slegend/fix/5412-twice-render

Fix #5412 - Twice render if attribute id not defined

components/lib/stepper/Stepper.vue

@@ -154,16 +154,16 @@ export default {
         };
     },
     watch: {
-        '$attrs.id': function (newValue) {
-            this.id = newValue || UniqueComponentId();
+        '$attrs.id': {
+            immediate: true,
+            handler: function (newValue) {
+                this.id = newValue || UniqueComponentId();
+            }
         },
         activeStep(newValue) {
             this.d_activeStep = newValue;
         }
     },
-    mounted() {
-        this.id = this.id || UniqueComponentId();
-    },
     methods: {
         isStep(child) {
             return child.type.name === 'StepperPanel';