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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <140313091950.ZM14399@torch.brasslantern.com>
Date: Thu, 13 Mar 2014 09:19:50 -0700
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To: zsh-workers@zsh.org
Subject: Problem with "read -q" / "read -k" and "zle -I"
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The "read -q" and "read -k N" builtins are supposed to work inside ZLE
widgets, but when "zle -I" has been executed the read waits for a newline.

# This works fine
zle-line-finish() {
  read -q $'?\nAre you sure [n/y]? '
}
zle -N zle-line-finish

# This waits for a newline
zle-line-finish() {
  zle -I
  read -q $'?\nAre you sure [n/y]? '
}
zle -N zle-line-finish

Note also that a newline is printed before the prompt with "zle -I".

It's necessary to call "zle -I" *after* the read in order to get the
display to update cleanly

See zsh-users "zsh detects rm *" thread for shenanigans that this made
necessary.