private DefaultActionGroup createFilteringActionsGroup() {
    final DefaultActionGroup group = new DefaultActionGroup();

    final AnAction[] groupingActions = createGroupingActions();
    for (AnAction groupingAction : groupingActions) {
      group.add(groupingAction);
    }

    addFilteringActions(group);
    group.add(new PreviewUsageAction(this));
    group.add(new SortMembersAlphabeticallyAction(this));
    return group;
  }
  public void addFilteringActions(DefaultActionGroup group) {
    final JComponent component = getComponent();
    final MergeDupLines mergeDupLines = new MergeDupLines();
    mergeDupLines.registerCustomShortcutSet(mergeDupLines.getShortcutSet(), component, this);
    group.add(mergeDupLines);

    final UsageFilteringRuleProvider[] providers =
        Extensions.getExtensions(UsageFilteringRuleProvider.EP_NAME);
    for (UsageFilteringRuleProvider provider : providers) {
      AnAction[] actions = provider.createFilteringActions(this);
      for (AnAction action : actions) {
        group.add(action);
      }
    }
  }
  private ActiveComponent createPinButton(
      final UsageInfoToUsageConverter.TargetElementsDescriptor descriptor,
      final UsageViewImpl usageView,
      final FindUsagesOptions options,
      final JBPopup[] popup,
      DefaultActionGroup pinGroup) {
    final AnAction pinAction =
        new AnAction(
            "Open Find Usages Toolwindow",
            "Show all usages in a separate toolwindow",
            AllIcons.General.AutohideOff) {
          {
            AnAction action = ActionManager.getInstance().getAction(IdeActions.ACTION_FIND_USAGES);
            setShortcutSet(action.getShortcutSet());
          }

          @Override
          public void actionPerformed(AnActionEvent e) {
            hideHints();
            popup[0].cancel();
            FindUsagesManager findUsagesManager =
                ((FindManagerImpl) FindManager.getInstance(usageView.getProject()))
                    .getFindUsagesManager();
            FindUsagesManager.SearchData data = new FindUsagesManager.SearchData();
            data.myOptions = options;
            List<SmartPsiElementPointer<PsiElement>> plist = descriptor.getAllElementPointers();

            data.myElements = plist.toArray(new SmartPsiElementPointer[plist.size()]);
            findUsagesManager.rerunAndRecallFromHistory(data);
          }
        };
    pinGroup.add(pinAction);
    final ActionToolbar pinToolbar =
        ActionManager.getInstance()
            .createActionToolbar(ActionPlaces.USAGE_VIEW_TOOLBAR, pinGroup, true);
    pinToolbar.setReservePlaceAutoPopupIcon(false);
    final JComponent pinToolBar = pinToolbar.getComponent();
    pinToolBar.setBorder(null);
    pinToolBar.setOpaque(false);

    return new ActiveComponent() {
      @Override
      public void setActive(boolean active) {}

      @Override
      public JComponent getComponent() {
        return pinToolBar;
      }
    };
  }
  private JComponent createActionsToolbar() {
    DefaultActionGroup group =
        new DefaultActionGroup() {
          @Override
          public void update(AnActionEvent e) {
            super.update(e);
            myButtonPanel.update();
          }

          @Override
          public boolean isDumbAware() {
            return true;
          }
        };

    AnAction[] actions = createActions();
    for (final AnAction action : actions) {
      if (action != null) {
        group.add(action);
      }
    }
    return toUsageViewToolbar(group);
  }
  @NotNull
  private JBPopup createUsagePopup(
      @NotNull final List<Usage> usages,
      @NotNull final UsageInfoToUsageConverter.TargetElementsDescriptor descriptor,
      @NotNull Set<UsageNode> visibleNodes,
      @NotNull final FindUsagesHandler handler,
      final Editor editor,
      @NotNull final RelativePoint popupPosition,
      final int maxUsages,
      @NotNull final UsageViewImpl usageView,
      @NotNull final FindUsagesOptions options,
      @NotNull final JTable table,
      @NotNull final UsageViewPresentation presentation,
      @NotNull final AsyncProcessIcon processIcon,
      boolean hadMoreSeparator) {
    table.setRowHeight(PlatformIcons.CLASS_ICON.getIconHeight() + 2);
    table.setShowGrid(false);
    table.setShowVerticalLines(false);
    table.setShowHorizontalLines(false);
    table.setTableHeader(null);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_LAST_COLUMN);
    table.setIntercellSpacing(new Dimension(0, 0));

    PopupChooserBuilder builder = new PopupChooserBuilder(table);
    final String title = presentation.getTabText();
    if (title != null) {
      String result = getFullTitle(usages, title, hadMoreSeparator, visibleNodes.size() - 1, true);
      builder.setTitle(result);
      builder.setAdText(getSecondInvocationTitle(options, handler));
    }

    builder.setMovable(true).setResizable(true);
    builder.setItemChoosenCallback(
        new Runnable() {
          @Override
          public void run() {
            int[] selected = table.getSelectedRows();
            for (int i : selected) {
              Object value = table.getValueAt(i, 0);
              if (value instanceof UsageNode) {
                Usage usage = ((UsageNode) value).getUsage();
                if (usage == MORE_USAGES_SEPARATOR) {
                  appendMoreUsages(editor, popupPosition, handler, maxUsages);
                  return;
                }
                navigateAndHint(usage, null, handler, popupPosition, maxUsages, options);
              }
            }
          }
        });
    final JBPopup[] popup = new JBPopup[1];

    KeyboardShortcut shortcut = UsageViewImpl.getShowUsagesWithSettingsShortcut();
    if (shortcut != null) {
      new DumbAwareAction() {
        @Override
        public void actionPerformed(AnActionEvent e) {
          popup[0].cancel();
          showDialogAndFindUsages(handler, popupPosition, editor, maxUsages);
        }
      }.registerCustomShortcutSet(new CustomShortcutSet(shortcut.getFirstKeyStroke()), table);
    }
    shortcut = getShowUsagesShortcut();
    if (shortcut != null) {
      new DumbAwareAction() {
        @Override
        public void actionPerformed(AnActionEvent e) {
          popup[0].cancel();
          searchEverywhere(options, handler, editor, popupPosition, maxUsages);
        }
      }.registerCustomShortcutSet(new CustomShortcutSet(shortcut.getFirstKeyStroke()), table);
    }

    InplaceButton settingsButton =
        createSettingsButton(
            handler,
            popupPosition,
            editor,
            maxUsages,
            new Runnable() {
              @Override
              public void run() {
                popup[0].cancel();
              }
            });

    ActiveComponent spinningProgress =
        new ActiveComponent() {
          @Override
          public void setActive(boolean active) {}

          @Override
          public JComponent getComponent() {
            return processIcon;
          }
        };
    builder.setCommandButton(new CompositeActiveComponent(spinningProgress, settingsButton));

    DefaultActionGroup toolbar = new DefaultActionGroup();
    usageView.addFilteringActions(toolbar);

    toolbar.add(UsageGroupingRuleProviderImpl.createGroupByFileStructureAction(usageView));
    toolbar.add(
        new AnAction(
            "Open Find Usages Toolwindow",
            "Show all usages in a separate toolwindow",
            AllIcons.Toolwindows.ToolWindowFind) {
          {
            AnAction action = ActionManager.getInstance().getAction(IdeActions.ACTION_FIND_USAGES);
            setShortcutSet(action.getShortcutSet());
          }

          @Override
          public void actionPerformed(AnActionEvent e) {
            hideHints();
            popup[0].cancel();
            FindUsagesManager findUsagesManager =
                ((FindManagerImpl) FindManager.getInstance(usageView.getProject()))
                    .getFindUsagesManager();

            findUsagesManager.findUsages(
                handler.getPrimaryElements(),
                handler.getSecondaryElements(),
                handler,
                options,
                FindSettings.getInstance().isSkipResultsWithOneUsage());
          }
        });

    ActionToolbar actionToolbar =
        ActionManager.getInstance()
            .createActionToolbar(ActionPlaces.USAGE_VIEW_TOOLBAR, toolbar, true);
    actionToolbar.setReservePlaceAutoPopupIcon(false);
    final JComponent toolBar = actionToolbar.getComponent();
    toolBar.setOpaque(false);
    builder.setSettingButton(toolBar);

    popup[0] = builder.createPopup();
    JComponent content = popup[0].getContent();

    myWidth =
        (int)
            (toolBar.getPreferredSize().getWidth()
                + new JLabel(
                        getFullTitle(
                            usages, title, hadMoreSeparator, visibleNodes.size() - 1, true))
                    .getPreferredSize()
                    .getWidth()
                + settingsButton.getPreferredSize().getWidth());
    myWidth = -1;
    for (AnAction action : toolbar.getChildren(null)) {
      action.unregisterCustomShortcutSet(usageView.getComponent());
      action.registerCustomShortcutSet(action.getShortcutSet(), content);
    }

    return popup[0];
  }