56xfce4-qtconfig

# Set QT variables to only pass to gtk2 Xfce environment
# /etc/X11/Xsession.d/56xfce4-qtconfig
#
BASESTARTUP=$(basename "$STARTUP" | cut -d\  -f1)
if [ "$BASESTARTUP" = x-session-manager ]; then
    BASESTARTUP=$(basename $(readlink /etc/alternatives/x-session-manager))
fi
case "$BASESTARTUP" in
  xfce4-session|startxfce4)
      #set qt environment variables to follow user chosen platform
      #default plugin is gtk2
      #$HOME/.config/MX-Linux/qt_plugin.conf can hold a user settable value
      file="$HOME/.config/MX-Linux/qt_plugin.conf"
      plugin="gtk2"
      if [ -e "$file" ]; then
		plugin=$(cat "$file")
	  fi
      export QT_QPA_PLATFORMTHEME="$plugin"
      export QT_PLATFORMTHEME="$plugin"
      export QT_PLATFORM_PLUGIN="$plugin"
      if command -v xfconf-query >/dev/null; then
         export QT_SCALE_FACTOR=$(xfconf-query -c xsettings -p /Gdk/WindowScalingFactor 2>/dev/null)
         [ -z "${QT_SCALE_FACTOR}" ] && unset QT_SCALE_FACTOR
      fi
      ;;
esac