Tests: open the folded Window group to reach the Full Screen button (#2864)

The ribbon now shrinks its groups to fit the window (#662), and on the
View tab the Window group folds into a drop-down at 1440 pt: the Full
Screen button then lives in that menu, so the a11y query no longer finds
it and the test failed on the folded ribbon. Open the group when it is
folded, and click the button where it is.

crates/ui-egui/src/lib.rs

@@ -6920,14 +6920,27 @@ mod tests {
         for _ in 0..3 {
             h.step();
         }
-        // The click's frames carry the viewport command, so collect while clicking.
-        let click_full_screen = |h: &mut egui_kittest::Harness<WordApp>| {
-            let mut out = Vec::new();
+        // The View tab's Window group folds into a drop-down when the window is narrow (#662),
+        // and the button then lives in that menu: open the group when it is folded.
+        fn full_screen<'a>(h: &'a egui_kittest::Harness<'a, WordApp>) -> Option<egui_kittest::Node<'a>> {
             h.query_all(egui_kittest::kittest::By::new().role(egui::accesskit::Role::Button))
                 .into_iter()
                 .find(|n| n.accesskit_node().label().as_deref().is_some_and(|l| l.replace('\n', " ").contains("Full Screen")))
-                .unwrap_or_else(|| panic!("the Full Screen button is on the View tab"))
+        }
+        if full_screen(&h).is_none() {
+            h.query_all(egui_kittest::kittest::By::new().role(egui::accesskit::Role::Button))
+                .into_iter()
+                .find(|n| n.accesskit_node().label().as_deref() == Some("Window"))
+                .unwrap_or_else(|| panic!("the View tab has a Window group"))
                 .click();
+            for _ in 0..2 {
+                h.step();
+            }
+        }
+        // The click's frames carry the viewport command, so collect while clicking.
+        let click_full_screen = |h: &mut egui_kittest::Harness<WordApp>| {
+            let mut out = Vec::new();
+            full_screen(h).unwrap_or_else(|| panic!("the Full Screen button is on the View tab")).click();
             for _ in 0..2 {
                 h.step();
                 out.extend(h.output().viewport_output.values().flat_map(|v| v.commands.iter()).filter(|c| matches!(c, Fullscreen(_))).cloned());