public void refreshPresentation() {
   // 1. vertical 2. number of lines 3. soft wraps (4. ignore spaces)
   PresentationState current = new PresentationState();
   if (myFragmentedContent != null && !Comparing.equal(myPresentationState, current)) {
     myFragmentedContent.recalculate();
     refreshData(myFragmentedContent);
   }
   myPreviousDiff.registerCustomShortcutSet(myPreviousDiff.getShortcutSet(), myParent);
   myNextDiff.registerCustomShortcutSet(myNextDiff.getShortcutSet(), myParent);
 }
  public void buildUi() {
    myTopPanel = new JPanel(new BorderLayout());
    final JPanel wrapper = new JPanel();
    // final BoxLayout boxLayout = new BoxLayout(wrapper, BoxLayout.X_AXIS);
    wrapper.setLayout(new BorderLayout());
    myTitleLabel.setBorder(BorderFactory.createEmptyBorder(1, 2, 0, 0));
    wrapper.add(myTitleLabel, BorderLayout.WEST);
    DefaultActionGroup dag = new DefaultActionGroup();
    myPreviousDiff.copyShortcutFrom(ActionManager.getInstance().getAction("PreviousDiff"));
    myNextDiff.copyShortcutFrom(ActionManager.getInstance().getAction("NextDiff"));
    dag.add(new MyChangeContextAction());
    dag.add(myPreviousDiff);
    dag.add(myNextDiff);
    myPreviousDiff.registerCustomShortcutSet(myPreviousDiff.getShortcutSet(), myPanel);
    myNextDiff.registerCustomShortcutSet(myNextDiff.getShortcutSet(), myPanel);

    dag.add(new PopupAction());
    ActionToolbar toolbar =
        ActionManager.getInstance().createActionToolbar(ActionPlaces.UNKNOWN, dag, true);
    wrapper.add(toolbar.getComponent(), BorderLayout.EAST);

    myTopPanel.add(wrapper, BorderLayout.CENTER);

    final JPanel wrapperDiffs = new JPanel(new GridBagLayout());
    final JPanel oneMore = new JPanel(new BorderLayout());
    oneMore.add(wrapperDiffs, BorderLayout.NORTH);

    myCurrentHorizontal = myConfiguration.SHORT_DIFF_HORISONTALLY;
    myHorizontal = createPanel(true);
    myVertical = createPanel(false);

    myPanel.add(myTopPanel, BorderLayout.NORTH);
    myPanel.add(getCurrentPanel().getComponent(), BorderLayout.CENTER);

    myPreviousDiff.registerCustomShortcutSet(myPreviousDiff.getShortcutSet(), myParent);
    myNextDiff.registerCustomShortcutSet(myNextDiff.getShortcutSet(), myParent);
  }