Overriding (some?) key bindings in REPL does not seem to work

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I finally figured this out. It was actually a combination of OhMyREPL and the system image compilation that caused the issue. But the solution is much simpler than expected, even though it is a bit fragile and could break with future releases of OhMyREPL.

This needs to go in the startup.jl, in the atreplinit() block:

        OhMyREPL.Prompt.NEW_KEYBINDINGS["^W"] = function (s,o...)
            LineEdit.edit_kill_region(s)
            OhMyREPL.Prompt.rewrite_with_ANSI(s)
        end

This is because OhMyREPL already replaces the default keybinding with its own, and we need to override that.

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