Logik von Pop-Up Button verbessert

src/main/java/ChatGUI.java

@@ -160,6 +160,7 @@ public class ChatGUI implements ActionListener {
 		if (e.getSource() == popupButton) {
 			String message = inputTextField.getText();
 			inputTextField.setText("");
+			addMessage(message);
 			sendPopupMessage(message);
 		}