This is an iTerm2 feature, where one can slide a "time bar" and replay all they typed in the current opened session. Quite useful for when you wanna show others how exactly you got to the current point (in an installation)

:+1: but I think it's better suited for a plugin
Since all data go trough redux, it should be pretty easy using something like this:
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:+1: but I think it's better suited for a plugin