Fix focus issue in KV properties (winery#720)

Author: DominikVoigt

org.eclipse.winery.frontends/app/topologymodeler/src/app/properties/kv-properties/kv-properties.component.html

@@ -1,5 +1,5 @@
 <!--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-  ~ Copyright (c) 2020 Contributors to the Eclipse Foundation
+  ~ Copyright (c) 2020-2023 Contributors to the Eclipse Foundation
   ~
   ~ See the NOTICE file(s) distributed with this work for additional
   ~ information regarding copyright ownership.
@@ -24,7 +24,7 @@
         <th>
             Values
         </th>
-    <tr *ngFor="let key of nodeProperties | keysPipe">
+    <tr *ngFor="let key of nodeProperties | keysPipe; let i = index; trackBy: trackByFn">
         <td class="">{{key.key}}</td>
         <td class="">
                 <textarea

org.eclipse.winery.frontends/app/topologymodeler/src/app/properties/kv-properties/kv-properties.component.ts

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020 Contributors to the Eclipse Foundation
+ * Copyright (c) 2020-2023 Contributors to the Eclipse Foundation
  *
  * See the NOTICE file(s) distributed with this work for additional
  * information regarding copyright ownership.
@@ -164,6 +164,10 @@ export class KvPropertiesComponent implements OnInit, OnDestroy {
         }
     }
 
+    trackByFn(index, item) {
+        return index;
+    }
+
     checkAndSetPattern(key: string, value: string): void {
         const pattern = this.kvPatternMap[key];
         if (!new RegExp(pattern).test(value)) {