Hide the mouse when the user is typing in the editor - take 2 (#27519)

Closes #4461

Take 2 on https://github.com/zed-industries/zed/pull/25040. 

Fixes panic caused due to using `setHiddenUntilMouseMoves` return type
to `set` cursor on macOS.

Release Notes:

- Now cursor hides when the user is typing in editor. It will stay
hidden until it is moved again. This behavior is `true` by default, and
can be configured with `hide_mouse_while_typing` in settings.

---------

Co-authored-by: Peter Tripp <peter@zed.dev>
Co-authored-by: Thomas Mickley-Doyle <thomas@zed.dev>
Co-authored-by: Agus <agus@zed.dev>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>
Co-authored-by: Agus Zubiaga <hi@aguz.me>
Co-authored-by: Angelk90 <angelo.k90@hotmail.it>

crates/gpui/src/window.rs

@@ -407,7 +407,7 @@ pub(crate) type AnyMouseListener =
 
 #[derive(Clone)]
 pub(crate) struct CursorStyleRequest {
-    pub(crate) hitbox_id: HitboxId,
+    pub(crate) hitbox_id: Option<HitboxId>, // None represents whole window
     pub(crate) style: CursorStyle,
 }
 
@@ -1928,10 +1928,10 @@ impl Window {
 
     /// Updates the cursor style at the platform level. This method should only be called
     /// during the prepaint phase of element drawing.
-    pub fn set_cursor_style(&mut self, style: CursorStyle, hitbox: &Hitbox) {
+    pub fn set_cursor_style(&mut self, style: CursorStyle, hitbox: Option<&Hitbox>) {
         self.invalidator.debug_assert_paint();
         self.next_frame.cursor_styles.push(CursorStyleRequest {
-            hitbox_id: hitbox.id,
+            hitbox_id: hitbox.map(|hitbox| hitbox.id),
             style,
         });
     }
@@ -2984,7 +2984,11 @@ impl Window {
                 .cursor_styles
                 .iter()
                 .rev()
-                .find(|request| request.hitbox_id.is_hovered(self))
+                .find(|request| {
+                    request
+                        .hitbox_id
+                        .map_or(true, |hitbox_id| hitbox_id.is_hovered(self))
+                })
                 .map(|request| request.style)
                 .unwrap_or(CursorStyle::Arrow);
             cx.platform.set_cursor_style(style);
@@ -3241,6 +3245,7 @@ impl Window {
             keystroke,
             &dispatch_path,
         );
+
         if !match_result.to_replay.is_empty() {
             self.replay_pending_input(match_result.to_replay, cx)
         }