[Bug report] Cannot select code by double-clicking or long-pressing

[fengye1003]

I discovered that I can't select code by double-clicking or long pressing. That caused I cannot delete pieces of code and I cannot copy pieces of code by this way. It's good if you can add the feature that can allow developers use the long pressing and the double-clicking gesture.

[Chinese Version] 开发者你好！我发现Code App无法使用双击或者长按的方式呼出选择框，这导致开发者无法使用这两个手势选中与删除/复制代码，这对需要大片修改的代码部分是一个噩梦！望您能修改适配这两个手势，不胜感激！