public void onContentChangedIn(EditorSource source) {
    myDiffUpdater.contentRemoved(source);
    final EditorEx editor = source.getEditor();
    if (myIsHorizontal && source.getSide() == FragmentSide.SIDE1 && editor != null) {
      editor.setVerticalScrollbarOrientation(EditorEx.VERTICAL_SCROLLBAR_LEFT);
    }
    DiffSideView viewSide = getSideView(source.getSide());
    viewSide.setEditorSource(getProject(), source);
    Disposer.dispose(myScrollSupport);
    if (editor == null) {
      if (!myDisposed) {
        rediff();
      }
      return;
    }

    final MouseListener mouseListener =
        PopupHandler.installUnknownPopupHandler(
            editor.getContentComponent(),
            new MergeActionGroup(this, source.getSide()),
            ActionManager.getInstance());
    myDiffUpdater.contentAdded(source);
    editor.getSettings().setLineNumbersShown(true);
    editor.getSettings().setFoldingOutlineShown(false);
    editor.getFoldingModel().setFoldingEnabled(false);
    ((EditorMarkupModel) editor.getMarkupModel()).setErrorStripeVisible(true);

    Editor editor1 = getEditor(FragmentSide.SIDE1);
    Editor editor2 = getEditor(FragmentSide.SIDE2);
    if (editor1 != null && editor2 != null && myIsSyncScroll) {
      myScrollSupport.install(new EditingSides[] {this});
    }

    final VisibleAreaListener visibleAreaListener = mySplitter.getVisibleAreaListener();
    final ScrollingModel scrollingModel = editor.getScrollingModel();
    if (visibleAreaListener != null) {
      scrollingModel.addVisibleAreaListener(visibleAreaListener);
      scrollingModel.addVisibleAreaListener(myVisibleAreaListener);
    }
    myFontSizeSynchronizer.synchronize(editor);
    source.addDisposable(
        new Disposable() {
          public void dispose() {
            myFontSizeSynchronizer.stopSynchronize(editor);
          }
        });
    source.addDisposable(
        new Disposable() {
          public void dispose() {
            if (visibleAreaListener != null) {
              scrollingModel.removeVisibleAreaListener(visibleAreaListener);
              scrollingModel.removeVisibleAreaListener(myVisibleAreaListener);
            }
            editor.getContentComponent().removeMouseListener(mouseListener);
          }
        });
  }
  private void initTree(final MyTree tree, boolean isRightTree) {
    tree.setCellRenderer(new MyTreeCellRenderer());
    tree.setRootVisible(false);
    tree.setShowsRootHandles(true);
    UIUtil.setLineStyleAngled(tree);

    TreeUtil.installActions(tree);
    SmartExpander.installOn(tree);
    EditSourceOnDoubleClickHandler.install(tree);
    new TreeSpeedSearch(tree);

    PopupHandler.installUnknownPopupHandler(
        tree, createTreePopupActions(isRightTree), ActionManager.getInstance());
  }
  private JComponent createToolbar() {
    ActionGroup group =
        (ActionGroup)
            CustomActionsSchema.getInstance().getCorrectedAction(IdeActions.GROUP_MAIN_TOOLBAR);
    final ActionToolbar toolBar =
        myActionManager.createActionToolbar(ActionPlaces.MAIN_TOOLBAR, group, true);
    toolBar.setLayoutPolicy(ActionToolbar.WRAP_LAYOUT_POLICY);

    DefaultActionGroup menuGroup = new DefaultActionGroup();
    menuGroup.add(new ViewToolbarAction());
    menuGroup.add(new CustomizeUIAction());
    PopupHandler.installUnknownPopupHandler(toolBar.getComponent(), menuGroup, myActionManager);

    return toolBar.getComponent();
  }
  private void addCommentActionToEditor(
      Editor editor,
      String filePath,
      ChangeInfo changeInfo,
      String revisionId,
      Comment.Side commentSide) {
    if (editor == null) return;

    DefaultActionGroup group = new DefaultActionGroup();
    final AddCommentAction addCommentAction =
        addCommentActionBuilder
            .create(this, changeInfo, revisionId, editor, filePath, commentSide)
            .withText("Add Comment")
            .withIcon(AllIcons.Toolwindows.ToolWindowMessages)
            .get();
    addCommentAction.registerCustomShortcutSet(
        CustomShortcutSet.fromString("C"), editor.getContentComponent());
    group.add(addCommentAction);
    PopupHandler.installUnknownPopupHandler(
        editor.getContentComponent(), group, ActionManager.getInstance());
  }
  private void initTree(Tree tree) {
    tree.setCellRenderer(new MyTreeCellRenderer());
    tree.setRootVisible(false);
    tree.setShowsRootHandles(true);
    tree.setLineStyleAngled();

    TreeUtil.installActions(tree);
    SmartExpander.installOn(tree);
    new TreeSpeedSearch(tree);
    tree.addTreeWillExpandListener(
        new TreeWillExpandListener() {
          @Override
          public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException {
            ((PackageDependenciesNode) event.getPath().getLastPathComponent()).sortChildren();
          }

          @Override
          public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException {}
        });

    PopupHandler.installUnknownPopupHandler(
        tree, createTreePopupActions(), ActionManager.getInstance());
  }