Program: 103131
Project: 103131
Buggy source:
/** 
 * Updates this view i.e. <tt>CallPanel</tt> so that it depicts the current state of its model i.e. <tt>callConference</tt>. The update is performed in the AWT event dispatching thread.
 */
private void doUpdateViewFromModelInEventDispatchThread(){
  if (callConference.isEnded() || (callConference.getCallPeerCount() == 0)) {
    updateSettingsPanelInEventDispatchThread(true);
    return;
  }
  boolean isConference=isConference();
  boolean isVideo=CallManager.isVideoStreaming(callConference);
  CallPeer callPeer=null;
  boolean validateAndRepaint=false;
  if (callPanel != null) {
    boolean removeCallPanel;
    if (isConference) {
      if (callPanel instanceof BasicConferenceCallPanel) {
        if (isVideo) {
          removeCallPanel=!(callPanel instanceof VideoConferenceCallPanel);
        }
 else {
          removeCallPanel=(callPanel instanceof VideoConferenceCallPanel);
        }
      }
 else {
        removeCallPanel=true;
      }
    }
 else {
      if (callPanel instanceof OneToOneCallPanel) {
        if (callPeer == null) {
          List<CallPeer> callPeers=callConference.getCallPeers();
          if (!callPeers.isEmpty())           callPeer=callPeers.get(0);
        }
        removeCallPanel=!((OneToOneCallPanel)callPanel).getCallPeer().equals(callPeer);
      }
 else       removeCallPanel=true;
    }
    if (removeCallPanel) {
      remove(callPanel);
      validateAndRepaint=true;
      try {
        ((CallRenderer)callPanel).dispose();
      }
  finally {
        callPanel=null;
      }
    }
  }
  if (callPanel == null) {
    if (isConference) {
      if (isVideo) {
        callPanel=new VideoConferenceCallPanel(this,callConference,uiVideoHandler);
      }
 else {
        callPanel=new AudioConferenceCallPanel(this,callConference);
      }
    }
 else {
      if (callPeer == null) {
        List<CallPeer> callPeers=callConference.getCallPeers();
        if (!callPeers.isEmpty())         callPeer=callPeers.get(0);
      }
      if (callPeer != null) {
        callPanel=new OneToOneCallPanel(this,callPeer,uiVideoHandler);
      }
    }
    if (callPanel != null) {
      add(callPanel,BorderLayout.CENTER);
      validateAndRepaint=true;
    }
  }
  try {
    updateSettingsPanelInEventDispatchThread(false);
  }
  finally {
    if (validateAndRepaint) {
      if (isDisplayable()) {
        validate();
        repaint();
      }
 else       doLayout();
    }
  }
}

Fixed version (ground truth):
/** 
 * Updates this view i.e. <tt>CallPanel</tt> so that it depicts the current state of its model i.e. <tt>callConference</tt>. The update is performed in the AWT event dispatching thread.
 */
private void doUpdateViewFromModelInEventDispatchThread(){
  if (callConference.isEnded() || (callConference.getCallPeerCount() == 0)) {
    updateSettingsPanelInEventDispatchThread(true);
    return;
  }
  boolean isConference=isConference();
  boolean isVideo=CallManager.isVideoStreaming(callConference);
  CallPeer callPeer=null;
  boolean validateAndRepaint=false;
  if (callPanel != null) {
    boolean removeCallPanel;
    if (isConference) {
      if (callPanel instanceof BasicConferenceCallPanel) {
        if (isVideo) {
          removeCallPanel=!(callPanel instanceof VideoConferenceCallPanel);
        }
 else {
          removeCallPanel=(callPanel instanceof VideoConferenceCallPanel);
        }
      }
 else {
        removeCallPanel=true;
      }
    }
 else {
      if (callPanel instanceof OneToOneCallPanel) {
        if (callPeer == null) {
          List<CallPeer> callPeers=callConference.getCallPeers();
          if (!callPeers.isEmpty())           callPeer=callPeers.get(0);
        }
        removeCallPanel=!((OneToOneCallPanel)callPanel).getCallPeer().equals(callPeer);
      }
 else {
        if ((callPanel instanceof BasicConferenceCallPanel) && ((BasicConferenceCallPanel)callPanel).hasDelayedCallPeers()) {
          removeCallPanel=false;
        }
 else {
          removeCallPanel=true;
        }
      }
    }
    if (removeCallPanel) {
      remove(callPanel);
      validateAndRepaint=true;
      try {
        ((CallRenderer)callPanel).dispose();
      }
  finally {
        callPanel=null;
      }
    }
  }
  if (callPanel == null) {
    if (isConference) {
      if (isVideo) {
        callPanel=new VideoConferenceCallPanel(this,callConference,uiVideoHandler);
      }
 else {
        callPanel=new AudioConferenceCallPanel(this,callConference);
      }
      ((BasicConferenceCallPanel)callPanel).addPeerViewlListener(this);
    }
 else {
      if (callPeer == null) {
        List<CallPeer> callPeers=callConference.getCallPeers();
        if (!callPeers.isEmpty())         callPeer=callPeers.get(0);
      }
      if (callPeer != null) {
        callPanel=new OneToOneCallPanel(this,callPeer,uiVideoHandler);
      }
    }
    if (callPanel != null) {
      add(callPanel,BorderLayout.CENTER);
      validateAndRepaint=true;
    }
  }
  try {
    updateSettingsPanelInEventDispatchThread(false);
  }
  finally {
    if (validateAndRepaint) {
      if (isDisplayable()) {
        validate();
        repaint();
      }
 else       doLayout();
    }
  }
}