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/platform/windows/platform.rs

@@ -54,7 +54,7 @@ pub(crate) struct WindowsPlatformState {
     menus: Vec<OwnedMenu>,
     dock_menu_actions: Vec<Box<dyn Action>>,
     // NOTE: standard cursor handles don't need to close.
-    pub(crate) current_cursor: HCURSOR,
+    pub(crate) current_cursor: Option<HCURSOR>,
 }
 
 #[derive(Default)]
@@ -558,11 +558,11 @@ impl Platform for WindowsPlatform {
     fn set_cursor_style(&self, style: CursorStyle) {
         let hcursor = load_cursor(style);
         let mut lock = self.state.borrow_mut();
-        if lock.current_cursor.0 != hcursor.0 {
+        if lock.current_cursor.map(|c| c.0) != hcursor.map(|c| c.0) {
             self.post_message(
                 WM_GPUI_CURSOR_STYLE_CHANGED,
                 WPARAM(0),
-                LPARAM(hcursor.0 as isize),
+                LPARAM(hcursor.map_or(0, |c| c.0 as isize)),
             );
             lock.current_cursor = hcursor;
         }
@@ -683,7 +683,7 @@ impl Drop for WindowsPlatform {
 pub(crate) struct WindowCreationInfo {
     pub(crate) icon: HICON,
     pub(crate) executor: ForegroundExecutor,
-    pub(crate) current_cursor: HCURSOR,
+    pub(crate) current_cursor: Option<HCURSOR>,
     pub(crate) windows_version: WindowsVersion,
     pub(crate) validation_number: usize,
     pub(crate) main_receiver: flume::Receiver<Runnable>,