Comment 3 for bug 1854092

Modified version of previous demo. Clipbard is cleaned in different way.. The same result, xsel version doesn't work

```
# MAIN
pbcopy </dev/null # clear clipboard
while :; do
   TXT="$(pbpaste)"
   if [ -n "$TXT" ]; then
      echo "$TXT"
      pbcopy </dev/null # clear clipboard
   else
      sleep 0.1 # sleep 100ms
   fi
done
```