Marcel Taeumel uploaded a new version of System to project The Trunk: http://source.squeak.org/trunk/System-mt.765.mcz
==================== Summary ====================
Name: System-mt.765 Author: mt Time: 28 August 2015, 10:02:11.682 am UUID: b40396ff-9c0f-bb46-9317-779e2ccb6448 Ancestors: System-topa.764
For consistency, also support setting and restoring regular preference within the scope of a block. Like flags (i.e. boolean preferences) support it.
=============== Diff against System-topa.764 ===============
Item was added: + ----- Method: Preferences class>>setPreference:toValue:during: (in category 'get/set') ----- + setPreference: prefSymbol toValue: anObject during: aBlock + + (self valueOfPreference: prefSymbol) in: [:previous | + self setPreference: prefSymbol toValue: anObject. + aBlock ensure: [self setPreference: prefSymbol toValue: previous]].!