QTableWidget拖动项放在无效区域时未删除

Question

正如标题所说，当我从QTableWidget拖动一个项目时，它向ui-> table-> children中添加了一个子项，然后将ChildAdded事件启动到我的eventFilter中，问题是如果我删除了被拖动的项放到不接受删除的区域中，则不会从ui-> table-> children中删除该子项，而在已启用删除的区域中释放被拖动的项将会这样做，并启动ChildRemoved事件。

这是我的初始化代码：

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    m_ui(new Ui::MainWindow)
{
    m_ui->setupUi(this);

    m_ui->left_table->installEventFilter(this);
    m_ui->right_table->installEventFilter(this);

    m_ui->left_table->setColumnCount(1);
    m_ui->left_table->setRowCount(25);
    m_ui->left_table->setHorizontalHeaderLabels({"Source"});
    m_ui->left_table->horizontalHeader()->setStretchLastSection(true);
    m_ui->left_table->setAcceptDrops(false);
    m_ui->left_table->setDragEnabled(true);

    m_ui->right_table->setColumnCount(1);
    m_ui->right_table->setHorizontalHeaderLabels({"Receiver"});
    m_ui->right_table->horizontalHeader()->setStretchLastSection(true);
    m_ui->right_table->setAcceptDrops(true);

    for (int i = 0; i < 25; ++i) {
        m_ui->left_table->setItem(i, 0, new QTableWidgetItem(QString::number(i)));
    }

    qDebug() << "Left childs: " << m_ui->left_table->children().size();
}

和事件过滤器：

bool MainWindow::eventFilter(QObject *watched, QEvent *event)
{
    if (event->type() == QEvent::ChildAdded || event->type() == QEvent::ChildRemoved) {
        qDebug() << "Object: " << watched->objectName()
                 << " Event: " << event->type()
                 << "Childs: " << m_ui->left_table->children().size();
    }
    return false;
}

放置在无效区域上的示例，这不会删除之前添加的子项：

放置有效区域的示例，这将删除子项并调用ChildRemoved事件：