SPARK-1735: MUC occupants list should have width (#196)

This commit attempts to prevent that the occupants list in a MUC
screen has a near-zero width.

src/java/org/jivesoftware/spark/ui/conferences/GroupChatParticipantList.java

@@ -129,6 +129,7 @@ public class GroupChatParticipantList extends JPanel {
 		agentInfoPanel = new ImageTitlePanel(Res
 				.getString("message.participants.in.room"));
 		participantsList = new JXList(model);
+		participantsList.setPreferredSize( new Dimension( 200, getHeight() ));
 		participantsList.setCellRenderer(new ParticipantRenderer());
 
 		// Set the room to track
@@ -202,6 +203,7 @@ userMap.put(displayName, userid);
 if (p.getType() == Presence.Type.available) {
 addParticipant(userid, p);
 agentInfoPanel.setVisible(true);
+	groupChatRoom.validate();
 } else {
 removeUser(displayName);
 }
@@ -656,19 +658,6 @@ groupChatRoom.notifySettingsAccessRight();
 	}
     }
 
-
-	/**
-	 * Let's make sure that the panel doesn't strech past the scrollpane view
-	 * pane.
-	 *
-	 * @return the preferred dimension
-	 */
-	public Dimension getPreferredSize() {
-		final Dimension size = super.getPreferredSize();
-		size.width = 150;
-		return size;
-	}
-
 	protected void checkPopup(MouseEvent evt) {
 	Point p = evt.getPoint();
 	final int index = participantsList.locationToIndex(p);

src/java/org/jivesoftware/spark/ui/rooms/GroupChatRoom.java

@@ -105,9 +105,9 @@ public class GroupChatRoom extends ChatRoom
         // Room Information
         roomInfo = UIComponentRegistry.createGroupChatParticipantList();
         getSplitPane().setRightComponent( roomInfo.getGUI() );
+        getSplitPane().setResizeWeight( 0.8 );
 
         roomInfo.setChatRoom( this );
-        getSplitPane().setResizeWeight( 1 );
 
         setupListeners();