gpui: Improve window.prompt to support ESC with non-English cancel text on macOS (#29538)

Release Notes:

- N/A

----

The before version GPUI used `Cancel` for cancel text, if we use
non-English text (e.g.: "取消" in Chinese), then the press `Esc` to cancel
will not work.

So this PR to change it by use `PromptButton` to instead the `&str`,
then we can use `PromptButton::cancel("取消")` for the `Cancel` button.

Run `cargo run -p gpui --example window` to test.

---

Platform Test:

- [x] macOS
- [x] Windows
- [x] Linux (x11 and Wayland)

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>
Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/gpui/src/platform/mac/window.rs

@@ -3,8 +3,8 @@ use crate::{
     AnyWindowHandle, Bounds, DisplayLink, ExternalPaths, FileDropEvent, ForegroundExecutor,
     KeyDownEvent, Keystroke, Modifiers, ModifiersChangedEvent, MouseButton, MouseDownEvent,
     MouseMoveEvent, MouseUpEvent, Pixels, PlatformAtlas, PlatformDisplay, PlatformInput,
-    PlatformWindow, Point, PromptLevel, RequestFrameOptions, ScaledPixels, Size, Timer,
-    WindowAppearance, WindowBackgroundAppearance, WindowBounds, WindowKind, WindowParams,
+    PlatformWindow, Point, PromptButton, PromptLevel, RequestFrameOptions, ScaledPixels, Size,
+    Timer, WindowAppearance, WindowBackgroundAppearance, WindowBounds, WindowKind, WindowParams,
     platform::PlatformInputHandler, point, px, size,
 };
 use block::ConcreteBlock;
@@ -902,7 +902,7 @@ impl PlatformWindow for MacWindow {
         level: PromptLevel,
         msg: &str,
         detail: Option<&str>,
-        answers: &[&str],
+        answers: &[PromptButton],
     ) -> Option<oneshot::Receiver<usize>> {
         // macOs applies overrides to modal window buttons after they are added.
         // Two most important for this logic are:
@@ -926,7 +926,7 @@ impl PlatformWindow for MacWindow {
             .iter()
             .enumerate()
             .rev()
-            .find(|(_, label)| **label != "Cancel")
+            .find(|(_, label)| !label.is_cancel())
             .filter(|&(label_index, _)| label_index > 0);
 
         unsafe {
@@ -948,11 +948,19 @@ impl PlatformWindow for MacWindow {
                 .enumerate()
                 .filter(|&(ix, _)| Some(ix) != latest_non_cancel_label.map(|(ix, _)| ix))
             {
-                let button: id = msg_send![alert, addButtonWithTitle: ns_string(answer)];
+                let button: id = msg_send![alert, addButtonWithTitle: ns_string(answer.label())];
                 let _: () = msg_send![button, setTag: ix as NSInteger];
+
+                if answer.is_cancel() {
+                    // Bind Escape Key to Cancel Button
+                    if let Some(key) = std::char::from_u32(super::events::ESCAPE_KEY as u32) {
+                        let _: () =
+                            msg_send![button, setKeyEquivalent: ns_string(&key.to_string())];
+                    }
+                }
             }
             if let Some((ix, answer)) = latest_non_cancel_label {
-                let button: id = msg_send![alert, addButtonWithTitle: ns_string(answer)];
+                let button: id = msg_send![alert, addButtonWithTitle: ns_string(answer.label())];
                 let _: () = msg_send![button, setTag: ix as NSInteger];
             }