feat(desktop): home app (system-only launch cap, LAUNCH_BADGE: apps+launch only), pm starts it with session (relaunch <=5); display keys F1/Alt+Tab next, F2 home, F4 close app (ROLE from launcher, terminal exempt), close returns to previous window; closed window -> app exits; shell 'name &'; launch by id; pm stack 8, storage 16 clients

crates/servers/display-server/src/tests/server.rs

@@ -259,3 +259,42 @@ fn only_the_launcher_sets_an_accent_and_it_is_in_the_theme() {
     assert_eq!(accent(&mut s, other), theme::Theme::WHIMSY_DARK.accent);
     assert_eq!(accent(&mut s, app), theme::with_accent(theme::Theme::WHIMSY_DARK, theme::Rgba::rgb(pink as u32)).accent);
 }
+
+#[test]
+fn window_keys_raise_home_and_close_only_apps() {
+    let key = |s: &mut Srv, k: usize| {
+        s.host_mut_for_test().events = vec![[1, 10, k, 0], [2, 10, k, 0]];
+        s.signal(0);
+    };
+    let mut s = server();
+    let terminal = open(&mut s, 1, b"Terminal");
+    let home = open(&mut s, 2, b"Home");
+    let app = open(&mut s, 2, b"Tally");
+    assert_eq!(s.handle_call(home, [w::ROLE, w::role::HOME, 0, 0], None).0[0], w::OK);
+    assert_eq!(s.handle_call(app, [w::ROLE, w::role::APP, 0, 0], None).0[0], w::OK);
+    assert_eq!(s.handle_call(app, [w::ROLE, w::role::HOME, 0, 0], None).0[0], MALFORMED, "once");
+    s.handle_call(terminal, [w::BUFFER, 0, 0, 0], None);
+    assert_eq!(s.handle_call(terminal, [w::ROLE, w::role::APP, 0, 0], None).0[0], MALFORMED, "not once it runs");
+    let notify = CapSlot::new(9).unwrap();
+    s.handle_call(app, [w::SUBSCRIBE, 0, 0, 0], Some(notify));
+
+    key(&mut s, w::HOME_KEY);
+    assert_eq!(s.windows_front_for_test(), s.slot_for_test(home));
+    key(&mut s, w::CLOSE_KEY);
+    assert!(s.slot_for_test(home).is_some(), "Home is not closed");
+    // The app in front: closed, and told.
+    s.handle_call(app, [w::POLL, 0, 0, 0], None);
+    key(&mut s, w::SWITCH_KEY);
+    assert_eq!(s.windows_front_for_test(), s.slot_for_test(app));
+    key(&mut s, w::CLOSE_KEY);
+    assert_eq!(s.slot_for_test(app), None);
+    assert!(s.host().signalled.contains(&notify));
+    assert_eq!(s.handle_call(app, [w::POLL, 0, 0, 0], None).0[0], MALFORMED, "its window is gone");
+    // The terminal in front: kept.
+    key(&mut s, w::SWITCH_KEY);
+    while s.windows_front_for_test() != s.slot_for_test(terminal) {
+        key(&mut s, w::SWITCH_KEY);
+    }
+    key(&mut s, w::CLOSE_KEY);
+    assert!(s.slot_for_test(terminal).is_some());
+}

crates/servers/display-server/src/tests/windows.rs

@@ -67,3 +67,19 @@ fn a_launchers_windows_are_found_by_its_badge() {
     let (b, _) = w.open(5, b"two").unwrap();
     assert_eq!(w.opened_by(5).collect::<Vec<_>>(), [a, b]);
 }
+
+#[test]
+fn closing_the_front_window_brings_back_the_one_before_it() {
+    let mut w: Windows<u8> = Windows::new();
+    let (t, _) = w.open(1, b"Terminal").unwrap();
+    let (home, _) = w.open(2, b"Home").unwrap();
+    let (app, _) = w.open(2, b"Tally").unwrap();
+    assert!(w.close(app));
+    assert_eq!(w.front(), Some(home), "not the next slot round");
+    w.raise(t);
+    let (app2, _) = w.open(2, b"Snake").unwrap();
+    w.raise(home);
+    w.raise(app2);
+    w.close(app2);
+    assert_eq!(w.front(), Some(home));
+}