[Bug 10976] vi may lose ESCape key input

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10976

--- Comment #2 from Mike Berger <mabnhdev at gmail.com> ---
I would propose breaking out the read/buffering functionality into
read_key_raw().  Keep the ESC sequence processing in read_key() and use
read_key_raw() for the buffered input.

Then change vi to use read_key_raw() rather than read_key().

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