12085: fix customer search autofill issue

app/webpacker/controllers/mixins/useSearchCustomer.js

@@ -9,7 +9,7 @@ export const useSearchCustomer = (controller) => {
       fetch("/admin/search/customers.json?" + new URLSearchParams(params))
         .then((response) => response.json())
         .then((json) => {
-          this.items = json;
+          this.items = [...this.items, ...json];
           callback(json);
         })
         .catch((error) => {

app/webpacker/controllers/select_customer_controller.js

@@ -6,6 +6,7 @@ export default class extends TomSelectController {
   static values = { options: Object, distributor: Number };
 
   connect() {
+    this.items = [];
     useSearchCustomer(this);
     useRenderCustomer(this);
     const options = {
@@ -20,7 +21,6 @@ export default class extends TomSelectController {
     };
     super.connect(options);
     this.control.on("item_add", this.onItemSelect.bind(this));
-    this.items = [];
   }
 
   onItemSelect(id, item) {