ubuntu程序已经打开但是无法显示是怎么回事？

Question

【求助】我在ubuntu系统下使用atom编辑器，我不知道碰到了什么按键组合，atom就好像是跑到后台去了，症状如下：
１、用Alt+Tab切换程序仍然能看到atom，见下图：

２、同样是用Alt+Tab，将焦点切到atom上的时候，atom成了下图这个样子：

３、尝试过kill然后重新启动atom，或者fg atom,都还是这个样子。

我现在不知道怎么办了。希望有了解的帮个忙，非常感谢。

系统：ubuntu 14.04

Answer 1

Hahaha, I finally know what’s going on.

I accidentally pressed the key combination "Super (i.e. windows) + Ctrl + Down", which is the shortcut key to minimize the program.

But the strange thing is that such a minimized program can only be restored through "Super+Ctrl+Up", but cannot be brought out through "Alt+Tab".

Answer 2

For this kind of problem, just restart your computer