A new version of Morphic was added to project The Inbox:
http://source.squeak.org/inbox/Morphic-ct.1532.mcz

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

Name: Morphic-ct.1532
Author: ct
Time: 20 September 2019, 8:50:11.086726 pm
UUID: f16e48a8-1b9c-dc40-9320-d8e4d7fcbdc4
Ancestors: Morphic-mt.1526

Fix a bug in MorphicProject>>#setAsBackground:

Why should you be restricted to only change the background of the current world?

=============== Diff against Morphic-mt.1526 ===============

Item was changed:
  ----- Method: MorphicProject>>setAsBackground: (in category 'utilities') -----
  setAsBackground: aFormOrColorOrFillStyle
  	"Set  aForm as a background image."
  
  	| thisWorld newFill oldFill |
+ 	thisWorld := self world.
- 	thisWorld := self currentWorld.
  	
  	oldFill := thisWorld fillStyle.
  	thisWorld fillStyle: aFormOrColorOrFillStyle.
  	newFill := thisWorld fillStyle.
  	
  	newFill rememberCommand:
  		(Command new cmdWording: 'set background to a picture' translated;
  			undoTarget: thisWorld selector: #fillStyle: argument: oldFill;
  			redoTarget: thisWorld selector: #fillStyle: argument: newFill).
  	
+ 	thisWorld setProperty: #hasCustomBackground toValue: true.!
- 	thisWorld setProperty: #hasCustomBackground toValue: true.
- !