Marcel Taeumel uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-mt.1312.mcz

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

Name: System-mt.1312
Author: mt
Time: 14 February 2022, 10:56:07.505768 am
UUID: d4976d9c-d3c1-394c-b293-c9427cf3a8c7
Ancestors: System-mt.1311

Fixes the bug where Morphic windows on other than the current project where not scaled on display-scale changes.

=============== Diff against System-mt.1311 ===============

Item was changed:
  ----- Method: UserInterfaceTheme>>scaleMorphicToolsBy: (in category 'private - fonts') -----
  scaleMorphicToolsBy: factor
  
- 	Project current isMorphic ifFalse: [^ self].
  	(factor closeTo: 1) ifTrue: [^ self].
  	
+ 	(Project respondsTo: #allMorphicProjects) ifTrue: [
+ 		Project allMorphicProjects do: [:ea |
+ 			ea world submorphs
+ 				select: [:morph | morph isSystemWindow]
+ 				thenDo: [:window | window displayScaleChangedBy: factor] ]].!
- 	Project current world submorphs
- 		select: [:morph | morph isSystemWindow]
- 		thenDo: [:window | window displayScaleChangedBy: factor].!