Added deepRefresh - mechanism

additionally fixed bug not updating messageList when a
MessageStatusChange occurs (seriously, why did no one notice it before?)

client/src/main/java/envoy/client/ui/ListViewRefresh.java

@@ -0,0 +1,36 @@
+package envoy.client.ui;
+
+import javafx.scene.control.ListCell;
+import javafx.scene.control.ListView;
+
+/**
+ * This is a utility class that provides access to a refreshing mechanism for
+ * elements that were added without notifying the underlying {@link ListView}.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>ListViewRefresh.java</strong><br>
+ * Created: <strong>16.07.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Client v0.1-beta
+ */
+public class ListViewRefresh {
+
+	private ListViewRefresh() {}
+
+	/**
+	 * Deeply refreshes a {@code listview}, meaning it recomputes every single of
+	 * its {@link ListCell}s.
+	 * <p>
+	 * While it does work, it is <b>not the most efficient algorithm</b> possible.
+	 *
+	 * @param toRefresh the listView to refresh
+	 * @param <T>       the type of its {@code listcells}
+	 * @since Envoy Client v0.1-beta
+	 */
+	public static <T> void deepRefresh(ListView<T> toRefresh) {
+		final var items = toRefresh.getItems();
+		toRefresh.setItems(null);
+		toRefresh.setItems(items);
+	}
+}

client/src/main/java/envoy/client/ui/controller/ChatScene.java

@@ -31,9 +31,7 @@ import envoy.client.data.audio.AudioRecorder;
 import envoy.client.event.MessageCreationEvent;
 import envoy.client.net.Client;
 import envoy.client.net.WriteProxy;
-import envoy.client.ui.IconUtil;
+import envoy.client.ui.*;
-import envoy.client.ui.Restorable;
-import envoy.client.ui.SceneContext;
 import envoy.client.ui.listcell.ChatControl;
 import envoy.client.ui.listcell.ListCellFactory;
 import envoy.client.ui.listcell.MessageControl;
@@ -144,7 +142,7 @@ public final class ChatScene implements Restorable {
 					} catch (final IOException e1) {
 						logger.log(Level.WARNING, "Could not read current chat: ", e1);
 					}
-					Platform.runLater(() -> { messageList.refresh(); scrollToMessageListEnd(); });
+					Platform.runLater(() -> { ListViewRefresh.deepRefresh(messageList); scrollToMessageListEnd(); });
 				} else chat.incrementUnreadAmount();
 				// Moving chat with most recent unreadMessages to the top
 				Platform.runLater(() -> {
@@ -158,8 +156,9 @@ public final class ChatScene implements Restorable {
 		// Listen to message status changes
 		eventBus.register(MessageStatusChange.class, e -> localDB.getMessage(e.getID()).ifPresent(message -> {
 			message.setStatus(e.get());
-			// Update UI if in current chat
+			// Update UI if in current chat and the current user was the sender of the
-			if (currentChat != null && message.getSenderID() == currentChat.getRecipient().getID()) Platform.runLater(messageList::refresh);
+			// message
+			if (currentChat != null && message.getSenderID() == client.getSender().getID()) Platform.runLater(messageList::refresh);
 		}));
 
 		eventBus.register(GroupMessageStatusChange.class, e -> localDB.getMessage(e.getID()).ifPresent(groupMessage -> {
@@ -184,7 +183,7 @@ public final class ChatScene implements Restorable {
 			switch (e.getOperationType()) {
 				case ADD:
 					localDB.getUsers().put(contact.getName(), contact);
-					Chat chat = contact instanceof User ? new Chat(contact) : new GroupChat(client.getSender(), contact);
+					final Chat chat = contact instanceof User ? new Chat(contact) : new GroupChat(client.getSender(), contact);
 					Platform.runLater(() -> chatList.getItems().add(chat));
 					break;
 				case REMOVE:
@@ -499,7 +498,7 @@ public final class ChatScene implements Restorable {
 				localDB.getChats().remove(currentChat);
 				localDB.getChats().add(0, currentChat);
 			});
-			messageList.refresh();
+			ListViewRefresh.deepRefresh(messageList);
 			scrollToMessageListEnd();
 
 			// Request a new ID generator if all IDs were used