Updates: Status: FixProposed Comment #1 on issue 3845 by nicolas....@gmail.com: Polymorph extension shortSummary is not programmed the object way http://code.google.com/p/pharo/issues/detail?id=3845 Name: SLICE-Issue-3845-Polymorph-Diff-Tool-shortSummary-fails-for-postscript-nice.1 Dependencies: Polymorph-Tools-Diff-nice.49 Implement #shortSummary in subclasses rather than using ifTrue:ifFalse: chains Reminder: these chains fail in case mcz includes a Postscript... While at it, also sort the changes in a patch morph class-name-wise (though this should be a different Issue, but everyone shall know how lazy I can be at this time of the night) Note that the implementation is different from PSMCMergeMorph>>#model: But MC+Polymorph together makes such a big number of classes that I won't try to be any clever and won't spend any time guessing a way to factor this code out.