Marcel Taeumel uploaded a new version of Morphic to project The Trunk: http://source.squeak.org/trunk/Morphic-mt.2126.mcz
==================== Summary ====================
Name: Morphic-mt.2126 Author: mt Time: 28 August 2023, 5:10:28.265367 pm UUID: 87bda34a-4034-4841-bfbf-59b15ff1d1d3 Ancestors: Morphic-mt.2125
For tree widgets, adds missing #okToChange check. Now it behaves more like list widgets do.
=============== Diff against Morphic-mt.2125 ===============
Item was changed: ----- Method: SimpleHierarchicalListMorph>>specialKeyPressed: (in category 'event handling') ----- specialKeyPressed: asciiValue
+ self model okToChange + ifFalse: [^ false]. + (self arrowKey: asciiValue) ifTrue: [^ true]. asciiValue = 27 "escape" ifTrue: [ self currentEvent shiftPressed ifTrue: [self currentWorld putUpWorldMenuFromEscapeKey] ifFalse: [self yellowButtonActivity: false]. ^ true]. ^ false!