private void removeSelected() {
    CheckedTreeNode node = getSelectedToolNode();
    if (node != null) {
      int result = Messages.showYesNoDialog(
        this,
        ToolsBundle.message("tools.delete.confirmation"),
        ToolsBundle.message("dialog.title.delete.tool"),
        Messages.getWarningIcon()
      );
      if (result != Messages.YES) {
        return;
      }
      myIsModified = true;
      if (node.getUserObject() instanceof Tool tool) {
        CheckedTreeNode parentNode = (CheckedTreeNode)node.getParent();
        ((ToolsGroup)parentNode.getUserObject()).removeElement(tool);
        removeNodeFromParent(node);
        if (parentNode.getChildCount() == 0) {
          removeNodeFromParent(parentNode);
        }
      }
      else if (node.getUserObject() instanceof ToolsGroup) {
        removeNodeFromParent(node);
      }
      update();
      IdeFocusManager.getGlobalInstance().doWhenFocusSettlesDown(() -> IdeFocusManager.getGlobalInstance().requestFocus(myTree, true));
    }
  }
private void removeSelected()