I run Vim in zsh. And I often need to check something else in the terminal. So I just quickly suspend the editor by pressing Ctrl+Z and then type fg to get back.
Today, by chance, I noticed that the suspended job can be resumed by typing just r. I guess it stands for resume. However, this command works only immediately after suspending the job. If I run any shell command I have to use fg.
Is this feature documented somewhere? Or is it a hidden gem? I couldn't find.
(ZSH 5.1.1 on Fedora Linux.)