[regression?] nix repl: ctrl-c behaviour?

[xbreak]

It seems that when the nix repl went from using readline -> linenoise -> editline it lost the ctrl-c behaviour of aborting partially typed expressions. Example:

Welcome to Nix version 2.3. Type :? for help.

nix-repl> let foo = 1;
          in
          ^C
          ^C

I guess this was not intentional since more or less identical issues have been addressed previously (c.f. #1757, #2076). Currently it looks like the ctrl-c behaviour was last lost in PR #2228.

I have prepared a fix here https://github.com/xbreak/nix/tree/repl/ctrlc which sort of cherry picks from the previous solution when readline was used. I can create a PR if the approach look ok.