refined init_model: allow change of buffer name as caused by "Save as", for example;
avoid init_model while buffer.isLoading -- potentially prevent NPE of getText;
avoid emitting nested buffer.propertiesChanged events;
# -*- shell-script -*- :mode=shellscript:
#
# Isabelle user settings sample -- for use in $ISABELLE_HOME_USER/etc/settings
ISABELLE_USEDIR_OPTIONS="-i true -d pdf"
ISABELLE_LOGIC=HOL