当选项块底部延伸到浏览器窗口下方时，Select2下拉列表不会保持打开状态

When the bottom of the options box extends below the browser window, the options block does not stay open when clicked unless your mouse happens to be hovering over the box's scroll bar. If you click in the middle of the dropdown menu, it just snaps back up immediately, selecting whatever your house happens to have been hovering over. You can see what I am talking about here: When the bottom of the options box extends belo