Fabio Niephaus uploaded a new version of System to project The Trunk: http://source.squeak.org/trunk/System-fn.1039.mcz
==================== Summary ====================
Name: System-fn.1039 Author: fn Time: 4 August 2018, 3:59:47.821233 pm UUID: 7a41ec0c-4fbd-4caa-ab2e-4001e53478e7 Ancestors: System-pre.1038
Correctly detect headless mode when '-nodisplay' is used. According to [1], '-nodisplay' "is equivalent to '-vm display=none'".
[1] https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/e17db79411cfec767e04f...
=============== Diff against System-pre.1038 ===============
Item was changed: ----- Method: SmalltalkImage>>isHeadless (in category 'vm parameters') ----- isHeadless "Answer whether the command-line specified to launch the VM headless." self optionsDo: + [ : each | (#('display=none' '-headless' '-nodisplay' '-vm-display-null' ) includes: each) ifTrue: [ ^ true ] ]. - [ : each | (#('display=none' '-headless' '-vm-display-null' ) includes: each) ifTrue: [ ^ true ] ]. ^ false!