Christoph Thiede uploaded a new version of Morphic to project The Inbox:
http://source.squeak.org/inbox/Morphic-ct.1635.mcz

==================== Summary ====================

Name: Morphic-ct.1635
Author: ct
Time: 29 February 2020, 12:39:08.00383 pm
UUID: 1d028c27-ec3c-fd4f-924c-5c0372d0323e
Ancestors: Morphic-mt.1631

Proposal: Revive #errorOnStep detection. Introduce #setErrorOnStep to keep it (quite) easy to add non-morphic receivers into the steplist (such as ObjectExplorer). Hm, should we maybe define #setErrorOnStep as a method stub on Object?

=============== Diff against Morphic-mt.1631 ===============

Item was added:
+ ----- Method: Morph>>setErrorOnStep (in category 'WiW support') -----
+ setErrorOnStep
+ 
+ 	self setProperty: #errorOnStep toValue: true.!

Item was added:
+ ----- Method: StepMessage>>value: (in category 'evaluating') -----
+ value: anArgument
+ 
+ 	^ [super value: anArgument]
+ 		ifCurtailed: [
+ 			(self receiver respondsTo: #setErrorOnStep)
+ 				ifTrue: [self receiver setErrorOnStep]]!