Basically, MVC got bugs whenever the MorphicToolBuilder was extended
"recklessly" w/o considering the MVCToolBuilder.

MVC has no tree view yet---not even a fallback. Having this, we need to keep
the old-style FileList GUI for MVC.

Then the variety of list morphs are sometimes difficult for MVC. That is,
the multi-selection and challenging callbacks of the
AlternatePluggableListMorphOfMany makes it difficult to fall-back on
PluggableListMorph (resp. PluggableListView). One example is MessageTrace.

In the long run, we should provide a simple tree view for MVC (e.g. one like
Apple's multi-column views to just recycle PluggableListView in a scroll
pane) and merge multi-selection behavior of
AlternatePluggableListMorphOfMany into PluggableListMorph and think about
fall-backs to keep MVC development manageable.

Besides that: Everything looks fine. Not much effort required to keep MVC
functional. :)

Best,
Marcel



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