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/buttons/confirm.rs

@@ -97,13 +97,15 @@ fn expire(
     let (weak, generation) = (state.downgrade(), state.read(cx).generation);
     window.spawn(cx, async move |cx| {
         cx.background_executor().timer(after).await;
-        let cleared = weak.update(cx, |confirm, cx| {
-            if confirm.generation == generation {
-                clear(confirm);
-                cx.notify();
-            }
+        let cleared = cx.update(|_, cx| {
+            weak.update(cx, |confirm, cx| {
+                if confirm.generation == generation {
+                    clear(confirm);
+                    cx.notify();
+                }
+            })
         });
-        if let Err(error) = cleared {
+        if let Err(error) = cleared.and_then(|inner| inner) {
             log::error!("confirm button: state gone before it expired: {error:#}");
         }
     })

src/buttons/copy.rs

@@ -53,10 +53,13 @@ impl RenderOnce for CopyButton {
                 let weak = state.downgrade();
                 let reset = window.spawn(cx, async move |cx| {
                     cx.background_executor().timer(CONFIRM).await;
-                    if let Err(error) = weak.update(cx, |copied, cx| {
-                        copied._reset = None;
-                        cx.notify();
-                    }) {
+                    let cleared = cx.update(|_, cx| {
+                        weak.update(cx, |copied, cx| {
+                            copied._reset = None;
+                            cx.notify();
+                        })
+                    });
+                    if let Err(error) = cleared.and_then(|inner| inner) {
                         log::error!("copy button: reset lost its state: {error:#}");
                     }
                 });

src/buttons/segmented.rs

@@ -197,8 +197,8 @@ impl RenderOnce for SegmentedControl {
             .id(self.id.clone())
             .relative()
             .flex()
-            .flex_grow()
-            .flex_shrink()
+            .flex_grow_1()
+            .flex_shrink_1()
             .min_w(least * count as f32)
             .items_center()
             .child(measure_origin(state.clone(), Axis::Horizontal))

src/buttons/tests.rs

@@ -47,7 +47,7 @@ fn a_loading_button_ignores_presses_and_keeps_its_tab_stop(cx: &mut TestAppConte
         presses: 0,
     });
     let root = view.read_with(cx, |bench, _| bench.root.clone());
-    cx.update(|window, _| window.focus(&root));
+    cx.update(|window, cx| window.focus(&root, cx));
     press("tab", cx);
     press("enter", cx);
     assert_eq!(view.read_with(cx, |bench, _| bench.presses), 0);