Build line fix (#11566)

* Fix for RenderBuildLine

* Simple playwright test

src/frontend/tests/pui_printing.spec.ts

@@ -4,6 +4,26 @@ import { activateTableView, loadTab } from './helpers.js';
 import { doCachedLogin } from './login.js';
 import { setPluginState } from './settings.js';
 
+// Test for the label editing interface
+test('Printing - Label Editing', async ({ browser }) => {
+  const page = await doCachedLogin(browser, {
+    user: adminuser,
+    url: 'settings/admin/labels'
+  });
+
+  // Open a particular label template for editing
+  await page.getByRole('cell', { name: 'Sample build line label' }).click();
+
+  // Await expected entries
+  await page.getByRole('tab', { name: 'PDF Preview' }).waitFor();
+  await page.getByText('This is an example template').waitFor();
+  await page
+    .locator('div')
+    .filter({ hasText: /^BO\d+$/ })
+    .first()
+    .waitFor();
+});
+
 /*
  * Test for label printing.
  * Select a number of stock items from the table,