fixes #121503

src/vs/platform/list/browser/listService.ts

@@ -669,6 +669,15 @@ abstract class ResourceNavigator<T> extends Disposable {
 			return;
 		}
 
+		// copied from AbstractTree
+		const target = browserEvent.target as HTMLElement;
+		const onTwistie = target.classList.contains('monaco-tl-twistie')
+			|| (target.classList.contains('monaco-icon-label') && target.classList.contains('folder-icon') && browserEvent.offsetX < 16);
+
+		if (onTwistie) {
+			return;
+		}
+
 		const preserveFocus = false;
 		const pinned = true;
 		const sideBySide = (browserEvent.ctrlKey || browserEvent.metaKey || browserEvent.altKey);