Don't add threaded messages to the UI before their parents.

briar-api/src/main/java/org/briarproject/briar/api/client/MessageTree.java

@@ -21,6 +21,8 @@ public interface MessageTree<T extends MessageTree.MessageNode> {
 
 	Collection<T> depthFirstOrder();
 
+	boolean contains(MessageId m);
+
 	@NotNullByDefault
 	interface MessageNode {
 

briar-api/src/main/java/org/briarproject/briar/api/forum/event/ForumPostReceivedEvent.java

@@ -14,21 +14,26 @@ import javax.annotation.concurrent.Immutable;
 @NotNullByDefault
 public class ForumPostReceivedEvent extends Event {
 
-	private final ForumPostHeader forumPostHeader;
 	private final GroupId groupId;
+	private final ForumPostHeader header;
+	private final String body;
 
-	public ForumPostReceivedEvent(ForumPostHeader forumPostHeader,
-			GroupId groupId) {
-
-		this.forumPostHeader = forumPostHeader;
+	public ForumPostReceivedEvent(GroupId groupId, ForumPostHeader header,
+			String body) {
 		this.groupId = groupId;
-	}
-
-	public ForumPostHeader getForumPostHeader() {
-		return forumPostHeader;
+		this.header = header;
+		this.body = body;
 	}
 
 	public GroupId getGroupId() {
 		return groupId;
 	}
+
+	public ForumPostHeader getHeader() {
+		return header;
+	}
+
+	public String getBody() {
+		return body;
+	}
 }

briar-api/src/main/java/org/briarproject/briar/api/privategroup/event/GroupMessageAddedEvent.java

@@ -17,13 +17,14 @@ public class GroupMessageAddedEvent extends Event {
 
 	private final GroupId groupId;
 	private final GroupMessageHeader header;
+	private final String body;
 	private final boolean local;
 
 	public GroupMessageAddedEvent(GroupId groupId, GroupMessageHeader header,
-			boolean local) {
-
+			String body, boolean local) {
 		this.groupId = groupId;
 		this.header = header;
+		this.body = body;
 		this.local = local;
 	}
 
@@ -35,6 +36,10 @@ public class GroupMessageAddedEvent extends Event {
 		return header;
 	}
 
+	public String getBody() {
+		return body;
+	}
+
 	public boolean isLocal() {
 		return local;
 	}