tim Rowledge uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-tpr.520.mcz

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

Name: System-tpr.520
Author: tpr
Time: 25 March 2013, 2:19:09.759 pm
UUID: 54ea34c3-dcaa-4fc2-a560-98bcfb5cc5f7
Ancestors: System-fbs.519

Remove BitBlt|WarpBlt>current usage - it's a vestige of an old experiment

=============== Diff against System-fbs.519 ===============

Item was changed:
  ----- Method: Project>>makeThumbnail (in category 'menu messages') -----
  makeThumbnail
  	"Make a thumbnail image of this project from the Display."
  	viewSize ifNil: [viewSize := Display extent // 8].
  	thumbnail := Form extent: viewSize depth: Display depth.
+ 	(WarpBlt toForm: thumbnail)
- 	(WarpBlt current toForm: thumbnail)
  			sourceForm: Display;
  			cellSize: 2;  "installs a colormap"
  			combinationRule: Form over;
  			copyQuad: (Display boundingBox) innerCorners
  			toRect: (0 at 0 extent: viewSize).
  	(Smalltalk at: #InternalThreadNavigationMorph) ifNotNil: [:tnMorph |
  			tnMorph  cacheThumbnailFor: self].
  	^thumbnail
  !