Remove contextMenuModule per default

Remove context menu module for now as it is not supported in VS Code (eclipse-glsp/glsp#414)
 and causes focus issues

Author: tortmayr

packages/vscode-integration-webview/src/default-modules.ts

@@ -14,7 +14,7 @@
  * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
  ********************************************************************************/
 
-import { ModuleConfiguration } from '@eclipse-glsp/client';
+import { ModuleConfiguration, contextMenuModule } from '@eclipse-glsp/client';
 import { vscodeCopyPasteModule } from './features/copyPaste/copy-paste-module';
 import { vscodeDefaultModule } from './features/default/default-module';
 import { vscodeExportModule } from './features/export/export-module';
@@ -30,5 +30,6 @@ export const VSCODE_DEFAULT_MODULES = [
 ] as const;
 
 export const VSCODE_DEFAULT_MODULE_CONFIG: ModuleConfiguration = {
-    add: [...VSCODE_DEFAULT_MODULES]
+    add: [...VSCODE_DEFAULT_MODULES],
+    remove: [contextMenuModule]
 };

packages/vscode-integration-webview/src/glsp-diagram-widget.ts

@@ -73,9 +73,17 @@ export abstract class GLSPDiagramWidget {
             containerDiv.addEventListener('mouseleave', e => this.handleMouseLeave(e));
             window.addEventListener('focus', e => this.handleFocusChange(e, true));
             window.addEventListener('blur', e => this.handleFocusChange(e, false));
+            window.addEventListener('contextmenu', e => this.handleContextMenu(e));
         }
     }
 
+    handleContextMenu(e: MouseEvent): void {
+        // Prevent the default context menu for now
+        // Should be removed once we provide a proper context menu integration
+        e.preventDefault();
+        window.focus();
+    }
+
     handleMouseEnter(e: MouseEvent): void {
         this.containerDiv?.classList.add('mouse-enter');
         this.containerDiv?.classList.remove('mouse-leave');