fancy-ctrl-z.plugin.zsh

fancy-ctrl-z () {
  if [[ $#BUFFER -eq 0 ]]; then
    BUFFER="fg"
    zle accept-line -w
  else
    zle push-input -w
    zle clear-screen -w
  fi
}
zle -N fancy-ctrl-z
bindkey '^Z' fancy-ctrl-z