#!/bin/bash

current="$(wmctrl -d | awk '/\*/ {print $1}')"
currentopen="$(wmctrl -l | awk -v "curr=$current" 'curr==$2')"
opennames="$(echo "$currentopen" | awk '{for (i=4; i <= NF; i++) printf("%s%c", $i, (i==NF)?ORS:OFS)}')"

while read -r line; do
  wmctrl -r "$line" -b toggle,hidden
done <<< "$opennames"