Manage Rules test: check the dialog rect and which rule was deleted

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

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

@@ -48,13 +48,17 @@ fn many_rules_scroll_inside_a_dialog_that_fits_the_window() {
     let lowest = deletes.iter().map(|d| d.rect().bottom()).fold(0.0, f32::max);
     assert!(lowest <= SCREEN_H, "the list stays inside the window, lowest button at {lowest}");
     drop(deletes);
+    let window = h.get_by_label("Conditional Formatting Rules Manager").rect();
+    assert!(window.bottom() <= SCREEN_H, "the dialog fits the window, bottom at {}", window.bottom());
     // Deleting through the dialog removes the first rule and the dialog stays usable.
     // (The ribbon has a Delete button of its own, outside the dialog's window.)
-    let window = h.get_by_label("Conditional Formatting Rules Manager").rect();
     h.query_all_by_label("Delete").find(|d| window.contains_rect(d.rect())).unwrap().click();
     h.run_steps(4);
     let left = h.state().session.active().unwrap().wb.active().unwrap().cond_formats.len();
     assert_eq!(left, RULES - 1);
+    let first = h.state().session.active().unwrap().wb.active().unwrap().cond_formats[0].ranges[0].a1();
+    // New rules go first, so the one deleted was A3000.
+    assert_eq!(first, format!("A{}", RULES - 1), "the first rule was the one removed");
 }
 
 #[test]