fix: store composed path for deferred context menu open (#9645) (#9647)

Co-authored-by: Serhii Kulykov <iamkulykov@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

vaadin-context-menu-flow-parent/vaadin-context-menu-flow/src/main/resources/META-INF/frontend/contextMenuTargetConnector.js

@@ -13,6 +13,11 @@ function init(target) {
       }
       e.preventDefault();
       e.stopPropagation();
+      // The menu is opened later, after a server round-trip, when the event has
+      // finished dispatching and `composedPath()` returns an empty array. Capture
+      // the composed path now so the menu can resolve the target inside a shadow
+      // root (e.g. a grid cell) instead of the retargeted host.
+      e.__composedPath = e.composedPath();
       this.$contextMenuTargetConnector.openEvent = e;
       let detail = {};
       if (target.getContextMenuBeforeOpenDetail) {