implemented correct cloning of groups

src/src/App.jsx

@@ -32,7 +32,7 @@ import {
     Message as MessageDialog,
     SelectFile as SelectFileDialog, Icon,
 } from '@iobroker/adapter-react-v5';
-import { isGroup } from './Utils/utils';
+import { isGroup, deepClone } from './Utils/utils';
 import { recalculateFields, store, updateProject } from './Store';
 
 import Attributes from './Attributes';
@@ -684,6 +684,20 @@ class App extends Runtime {
             });
 
             const newKey = isGroup(newWidget) ? this.getNewGroupId(store.getState().visProject) : this.getNewWidgetId(store.getState().visProject);
+
+            if (isGroup(newWidget)) {
+                // copy all members
+                for (let i = 0; i < newWidget.data.members.length; i++) {
+                    const wid = newWidget.data.members[i];
+                    const newMember = deepClone(widgets[wid]);
+
+                    const newMemberId = this.getNewWidgetId(store.getState().visProject, i);
+                    widgets[newMemberId] = newMember;
+
+                    newWidget.data.members[i] = newMemberId;
+                }
+            }
+
             widgets[newKey] = newWidget;
             newKeys.push(newKey);
         });

src/src/Utils/utils.tsx

@@ -9,13 +9,23 @@ export interface ProjectSettings {
     statesDebounceTime: number;
 }
 
-export interface Widget {
+interface SingleWidget  {
     data: Record<string, unknown>;
     style: Record<string, unknown>;
     tpl: string;
     widgetSet: string;
 }
 
+interface Group extends SingleWidget {
+    tpl: '_tplGroup';
+    data: {
+        members: string[];
+        [other: string]: unknown
+    }
+}
+
+export type Widget = SingleWidget | Group;
+
 export interface View {
     activeWidgets: string[];
     filterList: string[];
@@ -29,6 +39,15 @@ export interface View {
  *
  * @param widget widget to check
  */
-export function isGroup(widget: Widget): boolean {
+export function isGroup(widget: Widget): widget is Group {
     return widget.tpl === '_tplGroup';
 }
+
+/**
+ * Stringify-parse copy with type inference
+ *
+ * @param object The object which should be cloned
+ */
+export function deepClone<T extends Record<string, unknown>>(object: T): T {
+    return JSON.parse(JSON.stringify(object));
+}