fix: performance degradation when scrolling

src/app/modules/data/list/search-page.component.ts

@@ -29,6 +29,7 @@ import {ContextMenuService} from '../../menu/context/context-menu.service';
 import {SettingsProvider} from '../../settings/settings.provider';
 import {DataRoutingService} from '../data-routing.service';
 import {DataProvider} from '../data.provider';
+import {DataSourceRefreshed} from './data-list.component';
 
 /**
  * SearchPageComponent queries things and shows list of things as search results and filter as context menu
@@ -71,6 +72,10 @@ export class SearchPageComponent implements OnInit {
    * Time to wait for search query if search text is changing
    */
   searchQueryDueTime = 1000;
+  /**
+   * Search response only ever contains a single SCThingType
+   */
+  singleTypeResponse = false;
   /**
    * Api query sorting
    */
@@ -183,6 +188,7 @@ export class SearchPageComponent implements OnInit {
 
     return this.dataProvider.search(searchOptions)
       .then(async (result) => {
+        this.singleTypeResponse = result.facets.find(facet => facet.field === 'type')?.buckets.length === 1;
         if (append) {
           let items = await this.items;
           // append results
@@ -219,10 +225,10 @@ export class SearchPageComponent implements OnInit {
    * Loads next page of things
    */
   // tslint:disable-next-line:no-any
-  async loadMore(event: any): Promise<void> {
+  async loadMore(finished: DataSourceRefreshed): Promise<void> {
     this.from += this.pageSize;
     await this.fetchAndUpdateItems(true);
-    event.target.complete();
+    finished(await this.items);
   }
 
   /**