Ensure `joy_connection_changed` is emitted on the main thread

core/input/input.cpp

@@ -475,7 +475,8 @@ void Input::joy_connection_changed(int p_idx, bool p_connected, String p_name, S
 	}
 	joy_names[p_idx] = js;
 
-	emit_signal(SNAME("joy_connection_changed"), p_idx, p_connected);
+	// Ensure this signal is emitted on the main thread, as some platforms (e.g. Linux) call this from a different thread.
+	call_deferred("emit_signal", SNAME("joy_connection_changed"), p_idx, p_connected);
 }
 
 Vector3 Input::get_gravity() const {