Implement mode comparator for ClientInfo.

parser_xmpp/src/com/dmdirc/addons/parser_xmpp/XmppChannelClientInfo.java

@@ -27,6 +27,8 @@ import com.dmdirc.parser.interfaces.ChannelClientInfo;
 import com.dmdirc.parser.interfaces.ChannelInfo;
 import com.dmdirc.parser.interfaces.ClientInfo;
 
+import java.util.Comparator;
+
 import javax.annotation.Nonnull;
 
 /**
@@ -69,6 +71,11 @@ public class XmppChannelClientInfo extends BaseChannelClientInfo {
         throw new UnsupportedOperationException("Not supported yet.");
     }
 
+    @Override
+    public Comparator<String> getImportantModeComparator() {
+        return Comparator.naturalOrder();
+    }
+
     @Override
     public int compareTo(@Nonnull final ChannelClientInfo o) {
         return 0; // TODO: Implement