Program: 117728
Project: 117728
Buggy source:
@Override public void open(Topic topic) throws TopicMapException, OpenTopicNotSupportedException {
  openedTopic=topic;
  if (currentDockable == null) {
    if (!dockedTopicPanels.isEmpty()) {
      currentDockable=dockedTopicPanels.keySet().iterator().next();
    }
  }
  if (currentDockable == null) {
    addDockable((TopicPanel)new TraditionalTopicPanel(),topic);
  }
 else {
    control.setFocusedDockable(currentDockable,true);
    TopicPanel currentTopicPanel=dockedTopicPanels.get(currentDockable);
    if (currentTopicPanel != null) {
      try {
        currentTopicPanel.open(topic);
        updateDockableTitle(currentTopicPanel);
      }
 catch (      OpenTopicNotSupportedException otnse) {
        ArrayList<TopicPanel> availableTopicPanels=new ArrayList();
        for (        Dockable dockable : dockedTopicPanels.keySet()) {
          TopicPanel availableTopicPanel=dockedTopicPanels.get(dockable);
          if (availableTopicPanel != null && availableTopicPanel.supportsOpenTopic()) {
            availableTopicPanels.add(availableTopicPanel);
          }
        }
        if (availableTopicPanels.isEmpty()) {
          addDockable((TopicPanel)new TraditionalTopicPanel(),topic);
        }
 else         if (availableTopicPanels.size() == 1) {
          TopicPanel alternativeTopicPanel=availableTopicPanels.get(0);
          alternativeTopicPanel.open(topic);
          updateDockableTitle(alternativeTopicPanel);
        }
 else {
          boolean askForATopicPanel=true;
          TopicPanel rememberedTargetTopicPanel=chainedTopicPanels.get(currentTopicPanel);
          if (rememberedTargetTopicPanel != null) {
            Dockable dockable=this.getDockableFor(rememberedTargetTopicPanel);
            if (dockable != null) {
              rememberedTargetTopicPanel.open(topic);
              updateDockableTitle(rememberedTargetTopicPanel);
              askForATopicPanel=false;
            }
 else {
              chainedTopicPanels.remove(currentTopicPanel);
            }
          }
          if (askForATopicPanel) {
            SelectTopicPanelPanel topicPanelSelector=new SelectTopicPanelPanel();
            topicPanelSelector.openInDialog(availableTopicPanels,wandora);
            if (topicPanelSelector.wasAccepted()) {
              TopicPanel userSelectedTopicPanel=topicPanelSelector.getSelectedTopicPanel();
              if (userSelectedTopicPanel != null) {
                userSelectedTopicPanel.open(topic);
                updateDockableTitle(userSelectedTopicPanel);
                if (topicPanelSelector.getRememberSelection()) {
                  chainedTopicPanels.put(currentTopicPanel,userSelectedTopicPanel);
                }
              }
            }
          }
        }
      }
    }
  }
  revalidate();
  repaint();
}

Fixed version (ground truth):
@Override public void open(Topic topic) throws TopicMapException, OpenTopicNotSupportedException {
  openedTopic=topic;
  if (currentDockable == null) {
    if (!dockedTopicPanels.isEmpty()) {
      currentDockable=dockedTopicPanels.keySet().iterator().next();
    }
  }
  if (currentDockable == null) {
    addDockable((TopicPanel)new TraditionalTopicPanel(),topic);
  }
 else {
    control.setFocusedDockable(currentDockable,true);
    TopicPanel currentTopicPanel=dockedTopicPanels.get(currentDockable);
    if (currentTopicPanel != null) {
      if (currentTopicPanel.supportsOpenTopic()) {
        currentTopicPanel.open(topic);
        updateDockableTitle(currentTopicPanel);
      }
 else {
        ArrayList<TopicPanel> availableTopicPanels=new ArrayList();
        for (        Dockable dockable : dockedTopicPanels.keySet()) {
          TopicPanel availableTopicPanel=dockedTopicPanels.get(dockable);
          if (availableTopicPanel != null && availableTopicPanel.supportsOpenTopic()) {
            availableTopicPanels.add(availableTopicPanel);
          }
        }
        if (availableTopicPanels.isEmpty()) {
          addDockable((TopicPanel)new TraditionalTopicPanel(),topic);
        }
 else         if (availableTopicPanels.size() == 1) {
          TopicPanel alternativeTopicPanel=availableTopicPanels.get(0);
          alternativeTopicPanel.open(topic);
          updateDockableTitle(alternativeTopicPanel);
        }
 else {
          boolean askForATopicPanel=true;
          TopicPanel rememberedTargetTopicPanel=chainedTopicPanels.get(currentTopicPanel);
          if (rememberedTargetTopicPanel != null) {
            Dockable dockable=this.getDockableFor(rememberedTargetTopicPanel);
            if (dockable != null) {
              rememberedTargetTopicPanel.open(topic);
              updateDockableTitle(rememberedTargetTopicPanel);
              askForATopicPanel=false;
            }
 else {
              chainedTopicPanels.remove(currentTopicPanel);
            }
          }
          if (askForATopicPanel) {
            SelectTopicPanelPanel topicPanelSelector=new SelectTopicPanelPanel();
            topicPanelSelector.openInDialog(availableTopicPanels,wandora);
            if (topicPanelSelector.wasAccepted()) {
              TopicPanel userSelectedTopicPanel=topicPanelSelector.getSelectedTopicPanel();
              if (userSelectedTopicPanel != null) {
                userSelectedTopicPanel.open(topic);
                updateDockableTitle(userSelectedTopicPanel);
                if (topicPanelSelector.getRememberSelection()) {
                  chainedTopicPanels.put(currentTopicPanel,userSelectedTopicPanel);
                }
              }
            }
          }
        }
      }
    }
  }
  revalidate();
  repaint();
}