REPL: restore julia> mode by pressing backspace at the beginning of the line

[elehcim]

When you enter shell or help mode, there's no way to go out from it if you entered some text, unless you delete all the text. In the original repl, you could just delete the ; or ? character.
I'd like to see something like going to the first position of the line and press backspace to restore julia mode.

In fact, the specular action is possible: type some text in julia mode, go to the first position and type ; or ? and in this way the relative mode is triggered.

(Opening this issue from this comment just to make sure it's not lost)

[ivarne]

Also reported in Keno/REPL.jl#30 (comment), but it is probably good to move it here now.

[ivarne]

Thanks @carlobaldassi!

[elehcim]

Thanks!