Hi!

Morphic-kb.652 is a first stab at implementing two-stage highlighting of
list selections. It changes PluggableListMorph behaviour, which is the
superclass of MorphicToolBuilder list classes. That means all ToolBuilder
built lists should be affected. Monticello already uses ToolBuilder if it's
present (see MCTool>>buildWindow), so the repository inspector
responsiveness is fixed to some extent.

A next step could be to show a wait cursor while the model is performing
its actions for the selection, iff the action takes some noticeable time
(else the cursor flickers annoyingly).

For the http repository it would be even better to have some kind of
download manager, which wouldn't block the ui while downloading. (But it
could have the side effect users downloading unneeded versions in excess).

Cheers, Balázs
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