fix on linux

src/ui.rs

@@ -495,10 +495,15 @@ impl UI {
         let p = "xdg-open";
         allow_err!(std::process::Command::new(p).arg(url).spawn());
     }
+
+    fn is_xfce(&self) -> bool {
+        crate::platform::is_xfce()
+    }
 }
 
 impl sciter::EventHandler for UI {
     sciter::dispatch_script_call! {
+        fn is_xfce();
         fn get_id();
         fn get_password();
         fn update_password(String);