A new version of ST80 was added to project The Inbox:
http://source.squeak.org/inbox/ST80-ct.270.mcz

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

Name: ST80-ct.270
Author: ct
Time: 29 April 2021, 3:17:17.120422 pm
UUID: 4bc7c665-0739-2c4c-8b46-75e840ae3bfb
Ancestors: ST80-ct.269

Complements Morphic-ct.1760. If an MVC editor does not have a model, ask the UIManager to open the text to spawn.

=============== Diff against ST80-ct.269 ===============

Item was changed:
  ----- Method: ParagraphEditor>>spawn (in category 'menu messages') -----
  spawn
  	"Create and schedule a message browser for the code of the model's 
  	selected message. Retain any edits that have not yet been accepted."
  	| code |
  	code := paragraph text string.
  	self cancel.
+ 	model
+ 		ifNotNil: [model spawn: code]
+ 		ifNil: [UIManager default edit: code].
- 	model notNil ifTrue:[model spawn: code].
  !