Morphic code runs outside UI process

[marceltaeumel]

It is unsafe to trigger a self changed: #aspect in tool models outside the Morphic UI process. Occasionally, bugs like this happen:

Find a better way to compute the data and then sync that self changed.: #commitList into the UI process like this:

commitListBuildProcess := 
	[aHistoryWalker continueDo: [:each | anOrderedCollection add: each].
	cachedCommitList := anOrderedCollection.
	Project current addDeferredUIMessage: [self changed: #commitList] ]
		forkAt: Processor userBackgroundPriority
		named: self class name, ' commit list builder'.