A new version of ST80 was added to project The Inbox:
http://source.squeak.org/inbox/ST80-ct.263.mcz

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

Name: ST80-ct.263
Author: ct
Time: 21 November 2020, 2:33:51.363822 pm
UUID: f3315492-4d28-f24c-971e-260fb9e743dd
Ancestors: ST80-mt.262

Fixes confirmation dialog before closing an MVCProject, which should also show up when closing the current MVCProject. Kind of complements ST80-ct.250, but no strong dependency.

=============== Diff against ST80-mt.262 ===============

Item was changed:
  ----- Method: MVCProject>>okToChange (in category 'release') -----
  okToChange
  	"If there is no open window, we are fine to close."
  	
+ 	^ (self world scheduledControllers size <= 1)
- 	^ (self parent ~~ Project current
- 		or: [self world scheduledControllers size <= 1])
  		or: [super okToChange]!