build: vendor published GPUI 0.2.2 for lifecycle patch

vendor/gpui/examples/ownership_post.rs

@@ -0,0 +1,35 @@
+use gpui::{App, Application, Context, Entity, EventEmitter, prelude::*};
+
+struct Counter {
+    count: usize,
+}
+
+struct Change {
+    increment: usize,
+}
+
+impl EventEmitter<Change> for Counter {}
+
+fn main() {
+    Application::new().run(|cx: &mut App| {
+        let counter: Entity<Counter> = cx.new(|_cx| Counter { count: 0 });
+        let subscriber = cx.new(|cx: &mut Context<Counter>| {
+            cx.subscribe(&counter, |subscriber, _emitter, event, _cx| {
+                subscriber.count += event.increment * 2;
+            })
+            .detach();
+
+            Counter {
+                count: counter.read(cx).count * 2,
+            }
+        });
+
+        counter.update(cx, |counter, cx| {
+            counter.count += 2;
+            cx.notify();
+            cx.emit(Change { increment: 2 });
+        });
+
+        assert_eq!(subscriber.read(cx).count, 4);
+    });
+}