Marcel Taeumel uploaded a new version of Tools to project The Trunk:
http://source.squeak.org/trunk/Tools-mt.1052.mcz

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

Name: Tools-mt.1052
Author: mt
Time: 30 April 2021, 9:42:59.802936 am
UUID: 7051fe94-6d06-724b-a1db-f1e369ab228e
Ancestors: Tools-mt.1051

After taking a look at Squeak 3.9, I figured out what ChangeSetBrowser is supposed to look like. :-D

(You can invoke it from the regular ChangeSorter via CMD+SHIFT+B in the list of change sets. Or the context menu there.)

=============== Diff against Tools-mt.1051 ===============

Item was added:
+ ----- Method: ChangeSetBrowser>>buildWith: (in category 'toolbuilder') -----
+ buildWith: builder
+ 
+ 	| max windowSpec |
+ 	max := self wantsOptionalButtons ifTrue:[0.42] ifFalse:[0.5].
+ 	windowSpec := self buildWindowWith: builder specs: {
+ 		(0.0 at 0.0 corner: 0.5 at max) -> [self buildClassListWith: builder].
+ 		(0.5 at 0.0 corner: 1.0 at max) -> [self buildMessageListWith: builder].
+ 		(0.0 at max corner: 1.0 at 1.0) -> [self buildCodePaneWith: builder] }.
+ 	^ builder build: windowSpec!