windows: Avoid setting the mouse cursor while the window is disabled (#33230)

Don’t set the mouse cursor when the window is disabled, it causes issues
with modal dialogs.

Release Notes:

- N/A

crates/gpui/src/platform/windows/events.rs

@@ -92,7 +92,7 @@ pub(crate) fn handle_msg(
         WM_DEADCHAR => handle_dead_char_msg(wparam, state_ptr),
         WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
         WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
-        WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
+        WM_SETCURSOR => handle_set_cursor(handle, lparam, state_ptr),
         WM_SETTINGCHANGE => handle_system_settings_changed(handle, lparam, state_ptr),
         WM_INPUTLANGCHANGE => handle_input_language_changed(lparam, state_ptr),
         WM_GPUI_CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
@@ -1108,11 +1108,24 @@ fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -
     Some(0)
 }
 
-fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
-    if matches!(
-        lparam.loword() as u32,
-        HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
-    ) {
+fn handle_set_cursor(
+    handle: HWND,
+    lparam: LPARAM,
+    state_ptr: Rc<WindowsWindowStatePtr>,
+) -> Option<isize> {
+    if unsafe { !IsWindowEnabled(handle).as_bool() }
+        || matches!(
+            lparam.loword() as u32,
+            HTLEFT
+                | HTRIGHT
+                | HTTOP
+                | HTTOPLEFT
+                | HTTOPRIGHT
+                | HTBOTTOM
+                | HTBOTTOMLEFT
+                | HTBOTTOMRIGHT
+        )
+    {
         return None;
     }
     unsafe {