[Enhancement] exit confirmation box/退出确认框

[RejectVanity]

When the back key is used to exit the software, it is desired that a dialog box pops up to confirm whether to exit the software.

在用返回键退出软件时，希望弹出对话框，以确认是否要退出软件。

[ZhangYaoan]

I think it is not necessary. If you exit the app by accident, you won't lose any data.