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/usr/share/zsh/functions/Zle/narrow-to-region-invisible is in zsh-common 5.0.2-3ubuntu6.

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# As narrow-to-region, but replaces the text outside the editable region
# with `...' if it was non-empty.  Can be used directly as a widget.

autoload -Uz narrow-to-region
narrow-to-region -p '...' -P '...' -n