如何在将窗体拖出屏幕并重新打开时修复自定义边框？

private Point mouseOffset;

private void Form1_MouseDown(object sender, MouseEventArgs e)
{
    mouseOffset = new Point(-e.X, -e.Y);
}

private void Form1_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        Point mousePos = Control.MousePosition;
        mousePos.Offset(mouseOffset.X, mouseOffset.Y);
        Location = mousePos;

        // 检查窗体是否超出屏幕范围
        if (!Screen.PrimaryScreen.WorkingArea.Contains(Location))
        {
            // 调整窗体位置到屏幕内部
            Location = new Point(
                Math.Max(Screen.PrimaryScreen.WorkingArea.Left, Math.Min(Location.X, Screen.PrimaryScreen.WorkingArea.Right - Width)),
                Math.Max(Screen.PrimaryScreen.WorkingArea.Top, Math.Min(Location.Y, Screen.PrimaryScreen.WorkingArea.Bottom - Height))
            );
        }
    }
}