Chris Muller uploaded a new version of SUnitGUI to project The Trunk:
http://source.squeak.org/trunk/SUnitGUI-cmm.78.mcz

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

Name: SUnitGUI-cmm.78
Author: cmm
Time: 27 December 2019, 10:59:41.297401 pm
UUID: 1c7d7b32-cdec-4875-80d8-7d2413e01a05
Ancestors: SUnitGUI-cmm.77

Fix TestRunner browser for use with Reuse Windows preference.  There's no way to spawn that model with any pre-selection, it's essentially a singleton browser in Squeak.

=============== Diff against SUnitGUI-cmm.77 ===============

Item was changed:
  ----- Method: TestRunner>>representsSameBrowseeAs: (in category 'accessing-ui') -----
  representsSameBrowseeAs: anotherModel 
+ 	^ true!
- 	^ self class = anotherModel class
- 	and: [ classesSelected = anotherModel classesSelected ]!