Fix username not updating on user list

src/main/java/fr/insa/clavardator/ui/users/UserActiveIndicatorController.java

@@ -34,7 +34,6 @@ public class UserActiveIndicatorController implements Initializable {
 	private void onStateChange(PropertyChangeEvent propertyChangeEvent) {
 		if (propertyChangeEvent.getPropertyName().equals("state")) {
 			final PeerUser.State newState = (PeerUser.State) propertyChangeEvent.getNewValue();
-			Log.v(this.getClass().getSimpleName(), "User state updated to " + newState.toString());
 			Platform.runLater(() -> updateState(newState == PeerUser.State.CONNECTED));
 		}
 	}

src/main/java/fr/insa/clavardator/ui/users/UserListItemController.java

@@ -3,9 +3,11 @@ package fr.insa.clavardator.ui.users;
 import com.jfoenix.controls.JFXButton;
 import fr.insa.clavardator.ui.ButtonPressEvent;
 import fr.insa.clavardator.users.PeerUser;
+import javafx.application.Platform;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
 
+import java.beans.PropertyChangeEvent;
 import java.net.URL;
 import java.util.ResourceBundle;
 
@@ -42,8 +44,21 @@ public class UserListItemController implements Initializable {
 		resetBackground();
 	}
 
+
+	private void onUsernameChange(PropertyChangeEvent propertyChangeEvent) {
+		if (propertyChangeEvent.getPropertyName().equals("username")) {
+			final String newUsername = (String) propertyChangeEvent.getNewValue();
+			Platform.runLater(() -> button.setText(newUsername));
+		}
+	}
+
 	public void setUser(PeerUser user) {
+		if (this.user != null) {
+			// remove old observer before setting new user
+			this.user.removeObserver(this::onUsernameChange);
+		}
 		this.user = user;
+		user.addObserver(this::onUsernameChange);
 		indicatorController.setUser(user);
 		button.setText(user.getUsername());
 		resetBackground();