tim Rowledge uploaded a new version of Morphic to project The Trunk:
http://source.squeak.org/trunk/Morphic-tpr.1616.mcz

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

Name: Morphic-tpr.1616
Author: tpr
Time: 10 January 2020, 12:48:57.601883 pm
UUID: 610759f5-a2a6-4e6b-beac-726336b039c8
Ancestors: Morphic-mt.1615

Simplest practical solution to bouncing progressbar morphs. If there are any active slots we ignore requests to change the 'requestedPosition'.

=============== Diff against Morphic-mt.1615 ===============

Item was changed:
  ----- Method: SystemProgressMorph>>requestedPosition: (in category 'accessing') -----
  requestedPosition: anObject
+ 	"only change the progress bar position if this is an occasion when the progress bar is opening with a single active bar. After that we don't want to change the position and leap around the screen"
+ 	activeSlots 	< 1 ifTrue:[ requestedPosition := anObject]!
- 
- 	requestedPosition := anObject!