fixes #46648

src/vs/base/browser/ui/list/listWidget.ts

@@ -388,7 +388,7 @@ const DefaultMultipleSelectionContoller = {
 	isSelectionRangeChangeEvent
 };
 
-const DefaultOpenController = {
+const DefaultOpenController: IOpenController = {
 	shouldOpen: (event: UIEvent) => {
 		if (event instanceof MouseEvent) {
 			return !isMouseRightClick(event);
@@ -396,7 +396,7 @@ const DefaultOpenController = {
 
 		return true;
 	}
-} as IOpenController;
+};
 
 class MouseController<T> implements IDisposable {
 

src/vs/editor/contrib/suggest/suggestWidget.ts

@@ -439,7 +439,8 @@ export class SuggestWidget implements IContentWidget, IDelegate<ICompletionItem>
 		this.list = new List(this.listElement, this, [renderer], {
 			useShadows: false,
 			selectOnMouseDown: true,
-			focusOnMouseDown: false
+			focusOnMouseDown: false,
+			openController: { shouldOpen: () => false }
 		});
 
 		this.toDispose = [