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                        Shift-enter to insert a line break inside a command without running
It'd be nice to press shift-enter to insert a line break inside a command (such as when you type def foo [] {} and decide to insert a line break between {} without running the command.
References
This feature exists in most browser consoles (see: Firefox, Chrome) as well as various IRC-like places (like Twitter DMs or Slack).
Add something similar to this in your keybindings.
    {
        name: insert_newline
        modifier: alt
        keycode: enter
        mode: emacs
        event: { edit: insertnewline }
    }
Thanks.