Try only setting the window on macos

src/filepicker.rs

@@ -19,7 +19,9 @@ impl FilePicker {
     }
 
     pub fn new_dialog(&self) -> FileDialogBuilder {
+        #[allow(unused_mut)]
         let mut dialog = rfd::AsyncFileDialog::new();
+        #[cfg(target_os = "macos")]
         if let Some(window) = self.window.as_ref().and_then(|w| w.upgrade()) {
             dialog = dialog.set_parent(&window);
         }