When refreshing a scene, only delay repaints if rethink finds new blocks to resolve

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@505 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/miso/client/MisoScenePanel.java

@@ -154,8 +154,8 @@ public class MisoScenePanel extends VirtualMediaPanel
     public void refreshScene ()
     {
         clearScene();
-        rethink();
-        _delayRepaint = true;
+        // Don't repaint immediately if we've gotten new penders from our rethink
+        _delayRepaint = rethink() > 0;
         _remgr.invalidateRegion(_vbounds);
     }