Port · Build: Zed's gpui at 1a28cff

gpui and gpui_platform now come from Zed's repo by git at 1a28cff,
the code gpui-pre 0.3.7 republishes, so the gallery can later build
for the browser. gpui takes stacker, as 0.2.2 always did, and
gpui_platform takes font-kit, without which macOS draws no text;
runtime_shaders moves to gpui_platform.

The API moved: focus, blur and Tab steps take cx, Corner is Anchor,
shaped lines paint with an alignment, defer_draw takes a content
mask, the inspector registers a factory, async updates return their
value, and wrapped lines are shared, not cloned. Updates through a
window context go through the window, so a closed window still ends
them as it did.

Where the new gpui behaves differently, Ely keeps its old intent.
Holds and reveals under a resting pointer survive typing through
gpui's input-modality-independent hover; previews the keyboard also
moves keep the default, and the calendar's leave ignores a key press.
Enter reaches a button inside the code editor, since gpui now arms a
key click on the press. The event logger skips a lone modifier. A
video and an image grid keep their shape in a flex column under
taffy 0.13, as a picture does.

AGENTS.md records the new stack and the rules this port changes; the
rest of the old gpui and taffy rules are re-tested in T44c.

src/shell/dialogs.rs

@@ -185,7 +185,7 @@ impl SplashScreen {
         };
         let handle = cx.open_window(options, |window, cx| {
             let focus = cx.focus_handle();
-            window.focus(&focus);
+            window.focus(&focus, cx);
             cx.new(|_| Hosted::new(self, focus))
         })?;
         log::info!("splash: shown");

src/shell/native.rs

@@ -103,12 +103,9 @@ mod mac {
         fn pick(&self, index: usize) {
             log::info!("tray: picked item {index}");
             let on_pick = self.on_pick.clone();
+            // The app outlives its run loop, the only place this task is polled.
             self.app
-                .spawn(async move |cx| {
-                    if let Err(error) = cx.update(|cx| on_pick(index, cx)) {
-                        log::error!("tray: app gone before item {index} ran: {error:#}");
-                    }
-                })
+                .spawn(async move |cx| cx.update(|cx| on_pick(index, cx)))
                 .detach();
         }
     }

src/shell/tests.rs

@@ -80,7 +80,7 @@ fn the_switcher_switches_on_release_so_its_opener_stays_shut(cx: &mut TestAppCon
         .expect("a managed window");
     });
     settle(cx);
-    cx.update(|window, _| window.focus_next());
+    cx.update(|window, cx| window.focus_next(cx));
     press("enter", cx);
     assert!(desk.read_with(cx, |desk, _| desk.open));
     let above = desk.read_with(cx, |desk, _| desk.enters_above);

src/shell/windows.rs

@@ -77,7 +77,7 @@ pub fn open_hosted<T: IntoElement + Clone + 'static>(
     };
     let handle = cx.open_window(options, |window, cx| {
         let focus = cx.focus_handle();
-        window.focus(&focus);
+        window.focus(&focus, cx);
         cx.new(|_| Hosted::new(content, focus))
     })?;
     log::info!("window: opened {title}");