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.

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

examples/gallery/script.rs

@@ -73,7 +73,7 @@ pub fn park(window: WindowHandle<Gallery>, cx: &mut AsyncApp) -> Result<()> {
 }
 
 fn opened(key: &str, cx: &mut AsyncApp) -> Result<gpui::AnyWindowHandle> {
-    cx.update(|cx| Opened::get(key, cx))?
+    cx.update(|cx| Opened::get(key, cx))
         .with_context(|| format!("no window opened as {key}"))
 }
 
@@ -231,15 +231,15 @@ pub async fn play(
             }
             Step::ExpectClosed(key) => {
                 let handle = opened(key, cx)?;
-                let open = cx.update(|cx| cx.windows().contains(&handle))?;
+                let open = cx.update(|cx| cx.windows().contains(&handle));
                 anyhow::ensure!(!open, "window {key} is still open");
-                cx.update(|cx| Opened::take(key, cx))?;
+                cx.update(|cx| Opened::take(key, cx));
                 log::info!("script: {key} closed");
             }
             Step::CloseWindow(key) => {
                 let handle = opened(key, cx)?;
                 handle.update(cx, |_, window, _| window.remove_window())?;
-                cx.update(|cx| Opened::take(key, cx))?;
+                cx.update(|cx| Opened::take(key, cx));
             }
         }
         cx.background_executor().timer(FRAME).await;
@@ -439,13 +439,13 @@ async fn target_bounds(
     cx: &mut AsyncApp,
 ) -> Result<Bounds<Pixels>> {
     let bounds = cx
-        .update(|cx| Probes::get(key, cx))?
+        .update(|cx| Probes::get(key, cx))
         .with_context(|| format!("probe {key} never rendered"))?;
     if window.update(cx, |gallery, _, cx| gallery.reveal(bounds, cx))? {
         cx.background_executor().timer(FRAME).await;
     }
     let bounds = cx
-        .update(|cx| Probes::get(key, cx))?
+        .update(|cx| Probes::get(key, cx))
         .with_context(|| format!("probe {key} vanished after scrolling"))?;
     log::info!("script: probe {key} at {bounds:?}");
     Ok(bounds)