Colin Putney uploaded a new version of System to project The Trunk: http://source.squeak.org/trunk/System-cwp.467.mcz
==================== Summary ====================
Name: System-cwp.467 Author: cwp Time: 28 December 2011, 10:43:22.531 pm UUID: f047d655-bc2b-4ea1-a7a8-c091bac02b0b Ancestors: System-laza.466
SystemOrganizer>>classify:under: now uses #at:ifAbsent: to look up a class when generating system change notifications. This prevents bogus change notifications and walk backs when running tests against SystemOrganizer instances.
=============== Diff against System-laza.466 ===============
Item was changed: ----- Method: SystemOrganizer>>classify:under: (in category 'accessing') ----- classify: element under: newCategory + | oldCategory class | - | oldCategory | oldCategory := self categoryOfElement: element. super classify: element under: newCategory. + class := Smalltalk at: element ifAbsent: [^ self]. SystemChangeNotifier uniqueInstance + class: class - class: (Smalltalk at: element) recategorizedFrom: oldCategory to: newCategory !