Only do manual focus follows mouse on macOS

kitty/mouse.c

@@ -478,9 +478,13 @@ focus_in_event() {
 
 void
 enter_event() {
+#ifdef __APPLE__
+    // On cocoa there is no way to configure the window manager to
+    // focus windows on mouse enter, so we do it ourselves
     if (OPT(focus_follows_mouse) && !global_state.callback_os_window->is_focused) {
         focus_os_window(global_state.callback_os_window, false);
     }
+#endif
 }
 
 void