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Date: Sat, 27 Feb 2016 08:47:56 -0800
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Subject: Re: No incremental undo in vi mode
From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh hackers list <zsh-workers@zsh.org>
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On Fri, Feb 26, 2016 at 10:35 PM, Michael Giuffrida
<michaelpg@google.com> wrote:
> When using vi bindings, my understanding is that `C-_` should trigger
> readline's undo behavior, as should `u` when in command mode.[1]

Zsh does not use readline.  It has its own editor with its own set of
key bindings.

> In zsh in vi mode, it just clears the whole line. So it's not useful for
> undoing the effect of glob expansion or other tab completion.

Are you sure you have C-_ bound to what you think you do?  With

bindkey -v
bindkey '\C-_' undo

I get the behavior you expect rather than the behavior you report.

What does

bindkey '\C-_'

output for you?