avoid jdk-11.0.6+10: it shows problem "S8217731: Font rendering and glyph spacing changed from jdk-8 to jdk-11" https://bugs.openjdk.java.net/browse/JDK-8217731 even though the changelog claims to have resolved this;
#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: invoke Haskell Tool Stack within the Isabelle environment
isabelle_stack "$@"