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/interaction/roving.rs

@@ -137,7 +137,7 @@ impl RenderOnce for RovingFocus {
                     *stop = to;
                     cx.notify();
                 });
-                window.focus(&handles[to]);
+                window.focus(&handles[to], cx);
             })
             .children(items)
     }

src/interaction/selection.rs

@@ -172,7 +172,7 @@ impl RenderOnce for SelectionArea {
                     })
                     .on_mouse_down(MouseButton::Left, move |event, window, cx| {
                         cx.stop_propagation();
-                        window.focus(&keys_to);
+                        window.focus(&keys_to, cx);
                         at.update(cx, |area, _| area.cursor = ix);
                         let adding = event.modifiers.platform || event.modifiers.shift;
                         press(&pressed(&now, &held, adding), window, cx)

src/interaction/tests.rs

@@ -49,9 +49,9 @@ fn settle(cx: &mut VisualTestContext) {
 }
 
 fn tab(stops: usize, cx: &mut VisualTestContext) {
-    cx.update(|window, _| {
-        window.blur();
-        (0..stops).for_each(|_| window.focus_next());
+    cx.update(|window, cx| {
+        window.blur(cx);
+        (0..stops).for_each(|_| window.focus_next(cx));
     });
     settle(cx);
 }
@@ -234,14 +234,17 @@ fn picked(host: &Entity<Bench>, cx: &mut VisualTestContext) -> Vec<String> {
 #[gpui::test]
 fn a_band_selects_what_it_crosses(cx: &mut TestAppContext) {
     let (host, cx) = bench(area, cx);
-    drag(
-        at(100.0, 100.0),
-        &[at(110.0, 95.0), at(150.0, 70.0), at(160.0, 60.0)],
-        Modifiers::none(),
-        cx,
-    );
-    assert_eq!(picked(&host, cx), ["b", "c"]);
+    let none = Modifiers::none();
+    cx.simulate_mouse_down(at(100.0, 100.0), MouseButton::Left, none);
+    for step in [at(110.0, 95.0), at(150.0, 70.0), at(160.0, 60.0)] {
+        cx.simulate_mouse_move(step, Some(MouseButton::Left), none);
+        settle(cx);
+    }
+    // gpui now clears debug bounds each frame, and the band leaves on release.
     assert!(cx.debug_bounds("selection-band").is_some());
+    cx.simulate_mouse_up(at(160.0, 60.0), MouseButton::Left, none);
+    settle(cx);
+    assert_eq!(picked(&host, cx), ["b", "c"]);
 }
 
 /// A press selects a tile alone, Command adds another, a press on empty space clears, and with focus Command-A takes all and Escape clears.