M5: controller buttons pressed with no frame shown are dropped

A controller button pressed while the player has no frame to show,
for example after the frame is deleted, no longer plays the
prototype's gamepad trigger once the frame comes back.

crates/ui-egui/src/present.rs

@@ -2198,6 +2198,9 @@ fn player(p: &mut Presenter, ui: &mut Ui, rect: Rect, now: f64, chrome: Chrome)
         p.restart(p.start, now);
     }
     if p.doc.as_ref().is_none_or(|d| !d.contains(p.current)) {
+        // Controller buttons pressed with no frame to show are dropped, as they are while a link
+        // notice shows.
+        p.pads.clear();
         if !chrome.pane {
             return Some(BarAction::Close);
         }
@@ -2228,6 +2231,8 @@ fn player(p: &mut Presenter, ui: &mut Ui, rect: Rect, now: f64, chrome: Chrome)
         // the prototype takes neither keys nor the pointer (Escape there cancels the notice).
         let keys = chrome.keys && p.link_notice.is_none() && (!chrome.pane || over);
         input(p, &ctx, &l, over && p.link_notice.is_none(), keys, chrome.pane, now);
+    } else {
+        p.pads.clear();
     }
     let Some(l) = layout(p, area, chrome) else { return action };
     p.shown = Some((p.current, l.place, l.clip.intersect(area)));

crates/ui-egui/src/present_tests.rs

@@ -137,6 +137,26 @@ fn preview_pane_opens_follows_edits_and_the_selection() {
     assert!(u.app.ui.preview.is_none());
 }
 
+/// A controller button pressed while the pane has no frame to show is dropped, and does not play
+/// once the frame comes back.
+#[test]
+fn controller_buttons_pressed_with_no_frame_shown_are_dropped() {
+    let (mut u, a, b, _) = setup();
+    let to_b = json!({"type": "navigate", "dest": b});
+    u.run("proto.interaction.add", json!({"id": a, "trigger": {"type": "keyPress", "key": "Gamepad A"}, "action": to_b}));
+    u.run("proto.preview", json!({"start": a}));
+    u.run("edit.delete", json!({"ids": [a]}));
+    let ctx = u.ctx.clone();
+    crate::control::handle(&mut u.app, &ctx, "ui.input", &json!({"events": [{"gamepad": "A"}]})).unwrap();
+    u.frames(2, Vec::new);
+    u.run("edit.undo", json!({}));
+    u.frames(2, Vec::new);
+    assert_eq!(u.preview()["current"], json!(a), "the button pressed with no frame shown did not play");
+    crate::control::handle(&mut u.app, &ctx, "ui.input", &json!({"events": [{"gamepad": "A"}]})).unwrap();
+    u.frames(2, Vec::new);
+    assert_eq!(u.preview()["current"], json!(b), "a button pressed with the frame shown plays");
+}
+
 /// Asserts the preview's device viewport and scroll range, wheel and drag scrolling, the
 /// end clamp with spring-back, and that navigation resets scroll to the top.
 #[test]