fix: Improve ARIA fallback generation for HTML-based menu items (#9827)

* fix: Improve ARIA fallback generation for HTML-based menu items

* chore: Remove unneeded cast

packages/blockly/core/menuitem.ts

@@ -114,7 +114,12 @@ export class MenuItem {
   getAriaLabel(): string {
     // This fallback should only be hit by Context Menu items as all
     // FieldDropdown options should have an ARIA label.
-    return this.ariaLabel || String(this.content);
+    return (
+      this.ariaLabel ||
+      (typeof this.content === 'string'
+        ? this.content
+        : this.content.textContent)
+    );
   }
 
   /** Dispose of this menu item. */

packages/blockly/tests/mocha/menu_item_test.js

@@ -173,4 +173,14 @@ suite('Menu items', function () {
     this.menuItem.performAction(new Event('click'));
     assert.isTrue(called);
   });
+
+  test('return accurate ARIA labels for HTML elements', function () {
+    const div = document.createElement('div');
+    const nestedDiv = document.createElement('div');
+    nestedDiv.textContent = 'nested';
+    div.textContent = 'test';
+    div.appendChild(nestedDiv);
+    const testMenuItem = new Blockly.MenuItem(div);
+    assert.equal(testMenuItem.getAriaLabel(), 'testnested');
+  });
 });