Calendar: avoid opening menu on unselected component

The javascript 'contextmenu' event is not consistent with its order. On
some machines, it is triggered right after right-click 'mousedown', on
other machines after 'mouseup'. This can lead to an unexpected
behavior, when the right-click is started outside a component and is
finished on a component. Because the selection is applied on
'mousedown', no component is selected, but the context menu of the
component is opened. This change cancels the opening of the popup window
when this case occurs.

451116

Author: Knicksaas

eclipse-scout-core/src/calendar/Calendar.ts

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2025 BSI Business Systems Integration AG
+ * Copyright (c) 2010, 2026 BSI Business Systems Integration AG
  *
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
@@ -1562,6 +1562,11 @@ export class Calendar extends Widget implements CalendarModel {
       if (!this.rendered || !this.attached || !this._calculateContextMenuVisible(event)) { // check needed because function is called asynchronously
         return;
       }
+      if (allowedType === Calendar.MenuType.CalendarComponent && !this.selectedComponent) {
+        // When right click is started outside the component and released on the component,
+        // no component is selected -> no context menu is opened
+        return;
+      }
       let filteredMenus = menus.filter(this.menus, [allowedType], {
           onlyVisible: true,
           defaultMenuTypes: this.defaultMenuTypes