A new version of ToolBuilder-Morphic was added to project The Inbox:
http://source.squeak.org/inbox/ToolBuilder-Morphic-ct.286.mcz

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

Name: ToolBuilder-Morphic-ct.286
Author: ct
Time: 15 January 2022, 10:19:51.009373 pm
UUID: 3c0068e7-ce8e-5f45-8782-34c92bc6ab5f
Ancestors: ToolBuilder-Morphic-ct.285

Fixes a nil MNU when interrupting a pluggable dialog.

Steps to reproduce (before):
	1. Do it:
		Project uiManager chooseFrom: ((1 to: 10) collect: #asWords).
	2. Interrupt/Debug invocation
	3. Close/cancel the dialog
	4. Abandon the debugger

During the unwinding logic, the dialog window would attempt to close itself a second time, neglecting the fact that the model had already been released.

Inbox because only 90% sure that this is the right fix. :-)

=============== Diff against ToolBuilder-Morphic-ct.285 ===============

Item was changed:
  ----- Method: PluggableDialogWindow>>delete (in category 'submorphs - add/remove') -----
  delete
  
+ 	self model ifNil: [^ super delete].
  	self model okToClose ifFalse: [^ self].
  	
  	self closeDialogSelector ifNotNil: [:sel | self model perform: sel].
  	
  	self model
  		windowIsClosing;
  		release.
  	self model: nil.
  	
  	super delete.!