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/forms/tests/dates.rs

@@ -1,6 +1,8 @@
+use std::rc::Rc;
+
 use gpui::{
-    Context, IntoElement, KeyUpEvent, Keystroke, ParentElement, Render, Styled, TestAppContext,
-    Window, div,
+    Context, IntoElement, KeyUpEvent, Keystroke, Modifiers, ParentElement, Render, Styled,
+    TestAppContext, Window, div, point, px,
 };
 use jiff::civil::{Date, Time, date, time};
 
@@ -38,7 +40,7 @@ fn a_date_picker_opens_and_picks_from_the_keyboard(cx: &mut TestAppContext) {
         value: Some(date(2026, 9, 10)),
         disabled: false,
     });
-    cx.update(|window, _| window.focus_next());
+    cx.update(|window, cx| window.focus_next(cx));
     cx.simulate_keystrokes("enter right enter");
     assert_eq!(
         view.read_with(cx, |view, _| view.value),
@@ -70,7 +72,7 @@ impl Render for Span {
 fn a_range_picker_takes_two_picks_in_either_order(cx: &mut TestAppContext) {
     setup(cx);
     let (view, cx) = cx.add_window_view(|_, _| Span { value: None });
-    cx.update(|window, _| window.focus_next());
+    cx.update(|window, cx| window.focus_next(cx));
     cx.simulate_keystrokes("enter enter left left enter");
     assert_eq!(
         view.read_with(cx, |view, _| view.value),
@@ -106,7 +108,7 @@ fn a_time_picker_steps_with_the_arrows(cx: &mut TestAppContext) {
     let (view, cx) = cx.add_window_view(|_, _| Clock {
         value: Some(time(9, 30, 0, 0)),
     });
-    cx.update(|window, _| window.focus_next());
+    cx.update(|window, cx| window.focus_next(cx));
     cx.simulate_keystrokes("enter down down");
     assert_eq!(
         view.read_with(cx, |view, _| view.value),
@@ -143,7 +145,7 @@ fn a_calendar_refuses_days_past_its_max(cx: &mut TestAppContext) {
         picked: None,
         max: Some(TODAY),
     });
-    cx.update(|window, _| window.focus_next());
+    cx.update(|window, cx| window.focus_next(cx));
     cx.simulate_keystrokes("right enter");
     assert_eq!(view.read_with(cx, |view, _| view.picked), None);
     cx.simulate_keystrokes("left enter");
@@ -157,7 +159,7 @@ fn a_picker_disabled_while_open_stops_picking(cx: &mut TestAppContext) {
         value: Some(date(2026, 9, 10)),
         disabled: false,
     });
-    cx.update(|window, _| window.focus_next());
+    cx.update(|window, cx| window.focus_next(cx));
     cx.simulate_keystrokes("enter");
     view.update(cx, |view, cx| {
         view.disabled = true;
@@ -177,18 +179,18 @@ fn the_month_buttons_carry_the_cursor(cx: &mut TestAppContext) {
         picked: None,
         max: None,
     });
-    cx.update(|window, _| {
-        window.focus_next();
-        window.focus_next();
-        window.focus_next();
+    cx.update(|window, cx| {
+        window.focus_next(cx);
+        window.focus_next(cx);
+        window.focus_next(cx);
     });
     cx.simulate_keystrokes("enter");
     cx.simulate_event(KeyUpEvent {
         keystroke: Keystroke::parse("enter").unwrap(),
     });
-    cx.update(|window, _| {
-        window.focus_prev();
-        window.focus_prev();
+    cx.update(|window, cx| {
+        window.focus_prev(cx);
+        window.focus_prev(cx);
     });
     cx.simulate_keystrokes("enter");
     assert_eq!(
@@ -196,3 +198,41 @@ fn the_month_buttons_carry_the_cursor(cx: &mut TestAppContext) {
         Some(date(2026, 10, 25))
     );
 }
+
+/// A calendar that records every preview it reports.
+struct Watched {
+    seen: Vec<Option<Date>>,
+}
+
+impl Render for Watched {
+    fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        let view = cx.entity();
+        Calendar::new("watched")
+            .selected(TODAY)
+            .today(TODAY)
+            .on_hover(Rc::new(move |date, _, cx| {
+                view.update(cx, |view, cx| {
+                    view.seen.push(date);
+                    cx.notify();
+                })
+            }))
+    }
+}
+
+#[gpui::test]
+fn keys_keep_the_preview_under_a_resting_pointer(cx: &mut TestAppContext) {
+    setup(cx);
+    let (view, cx) = cx.add_window_view(|_, _| Watched { seen: Vec::new() });
+    cx.update(|window, cx| window.focus_next(cx));
+    cx.simulate_mouse_move(point(px(120.0), px(200.0)), None, Modifiers::none());
+    let pointed = view.read_with(cx, |view, _| view.seen.last().copied().flatten());
+    assert!(pointed.is_some(), "the pointer rests on a day");
+    cx.simulate_keystrokes("pagedown");
+    cx.update(|window, _| window.refresh());
+    cx.run_until_parked();
+    assert_eq!(
+        view.read_with(cx, |view, _| view.seen.last().copied().flatten()),
+        Some(date(2026, 10, 25)),
+        "the keyboard's day stays the preview"
+    );
+}