[ADF-3930] fix infinite pagination (#4275)

* refactoring infinite pagination

* fix lint

* fix import reuqest pagination from core

* fix failing unit test

lib/core/models/pagination.model.ts

@@ -20,15 +20,15 @@ import { Pagination } from '@alfresco/js-api';
 export class PaginationModel extends Pagination {
     merge?: boolean;
 
-    constructor(obj?: any) {
-        super(obj);
-        if (obj) {
-            this.count = obj.count;
-            this.hasMoreItems = obj.hasMoreItems ? obj.hasMoreItems : false;
-            this.merge = obj.merge ? obj.merge : false;
-            this.totalItems = obj.totalItems;
-            this.skipCount = obj.skipCount;
-            this.maxItems = obj.maxItems;
+    constructor(input?: any) {
+        super(input);
+        if (input) {
+            this.count = input.count;
+            this.hasMoreItems = input.hasMoreItems ? input.hasMoreItems : false;
+            this.merge = input.merge ? input.merge : false;
+            this.totalItems = input.totalItems;
+            this.skipCount = input.skipCount;
+            this.maxItems = input.maxItems;
         }
     }
 }

lib/core/models/public-api.ts

@@ -24,3 +24,4 @@ export * from './ecm-company.model';
 export * from './redirection.model';
 export * from './pagination.model';
 export * from './oauth-config.model';
+export * from './request-pagination.model';

lib/core/models/request-pagination.model.ts

@@ -0,0 +1,31 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export class RequestPaginationModel {
+
+    skipCount?: number;
+
+    maxItems?: number;
+
+    merge?: boolean = false;
+
+    constructor(input?: any) {
+        if (input) {
+            Object.assign(this, input);
+        }
+    }
+}