A new version of EToys was added to project The Inbox:
http://source.squeak.org/inbox/EToys-kfr.414.mcz

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

Name: EToys-kfr.414
Author: kfr
Time: 31 October 2020, 8:58:48.943742 pm
UUID: 5e186cb9-67d7-124d-901e-ae50d4bacbe8
Ancestors: EToys-eem.413

self world returns nil when the morph is not visible/ opened yet

=============== Diff against EToys-eem.413 ===============

Item was changed:
  ----- Method: CategoryViewer>>assureCategoryFullyVisible (in category '*Etoys-Squeakland-categories') -----
  assureCategoryFullyVisible
  	"Keep deleting categoryviewers other than the receiver  until the receiver is fully visible."
  
  	| ready toDelete |
  	ready := false.
+ 	[(self bounds bottom > Project current world bottom) and: [ready not]] whileTrue: [
- 	[(self bounds bottom > self world bottom) and: [ready not]] whileTrue: [
  		owner submorphs size > 2
  			ifTrue: [
  				toDelete := owner submorphs allButFirst reversed
  					detect: [:cv | cv ~~ self]
  					ifNone: [^ self].
  				toDelete delete.
  				self world doOneCycleNow]
  			ifFalse: [
  				ready := true]].!