test(ui): the two-tab Redo test checks the copy's paragraph stays open

If the copy's editor had closed before or during Redo, the check for the
other tab's typing passed on an empty text. It now requires the editor
to be open before Redo and after it.

crates/ui-egui/tests/it/editing.rs

@@ -6675,11 +6675,12 @@ fn typing_in_one_tab_never_reaches_another_tabs_paragraph() {
     // The copy, its paragraph still open: Redo there has nothing of its own to put back.
     h.state_mut().active = Some(1);
     h.run_steps(3);
+    assert!(h.state().views[1].line_editor.is_some(), "the copy's paragraph is still open");
     h.key_press_modifiers(Modifiers::COMMAND | Modifiers::SHIFT, Key::Z);
     h.run_steps(3);
     let s = h.state();
-    let text = s.views[1].line_editor.as_ref().map(|ed| ed.text.clone());
-    assert!(!text.as_deref().unwrap_or_default().contains("secret"), "the other tab's typing came in: {text:?}");
+    let text = &s.views[1].line_editor.as_ref().expect("the copy's paragraph stays open through Redo").text;
+    assert!(!text.contains("secret"), "the other tab's typing came in: {text:?}");
     assert_eq!(s.session.get(s.views[1].id).unwrap().text_blocks(0)[0].text, s.session.get(s.views[0].id).unwrap().text_blocks(0)[0].text);
 }