thank you, SIGINT was the culprit.
trap "echo HUP>>/tmp/err" SIGHUP
trap "echo QUIT>>/tmp/err" SIGQUIT
trap "echo INT>>/tmp/err" SIGINT
trap "echo TERM >>/tmp/err" SIGTERM
revealed all
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https://www.reddit.com/r/bash/comments/axi4n6/closing_xterm_causes_the_app_to_exit_inspite_of/
Adding nohup works but ONLY for xclock xfontsel xpdf - hexchat and
firefox exit when the terminal exits - basically GTK apps.
Script creates a named-pipe .Xauthority to pass MIT-MAGIC-cookie data
to a