给定一个Gtk Notebook，如何将页面拖放到新窗口？

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

def on_drag_data_get(widget, drag_context, data, info, time):
    # 获取拖放数据
    notebook = widget.get_parent()
    page_num = notebook.page_num(widget)
    data.set_text(str(page_num), -1)

def on_drag_data_received(widget, drag_context, x, y, data, info, time):
    # 接收拖放数据
    page_num = int(data.get_text())
    notebook = widget.get_parent()
    page = notebook.get_nth_page(page_num)
    notebook.remove_page(page_num)

    new_notebook = Gtk.Notebook()
    new_notebook.append_page(page, Gtk.Label(label="New Page"))
    new_window = Gtk.Window()
    new_window.add(new_notebook)
    new_window.show_all()

def main():
    window = Gtk.Window()
    notebook = Gtk.Notebook()

    # 添加页面到Gtk Notebook
    page1 = Gtk.Label(label="Page 1")
    page2 = Gtk.Label(label="Page 2")
    notebook.append_page(page1, Gtk.Label(label="Page 1"))
    notebook.append_page(page2, Gtk.Label(label="Page 2"))

    # 启用拖放功能
    notebook.drag_source_set(Gtk.TargetEntry.new("text/plain", 0, 0), Gdk.DragAction.COPY)
    window.drag_dest_set(Gtk.DestDefaults.ALL, [Gtk.TargetEntry.new("text/plain", 0, 0)], Gdk.DragAction.COPY)

    # 连接拖放信号
    notebook.connect("drag-data-get", on_drag_data_get)
    window.connect("drag-data-received", on_drag_data_received)

    window.add(notebook)
    window.show_all()
    Gtk.main()

if __name__ == "__main__":
    main()