Using lots of trial and error, I finally found a solution. Or, rather a hack.

In Pharo 3:
Just set autoRefreshOnExpand to true, and then when there is need for
update, do:

self widget treeModel updateList

In Pharo 4:
For some reason autoRefreshOnExpand was removed, and now we also have to
manually reset children of all (at least all affected nodes). Something like
this:

node widget widget setChildren: node widget childrenBlock

(where node is instance of TreeNodeModel; root nodes can be obtained by
calling self widget treeModel rootNodes collect: #nodeModel)

However as this solution uses some implementation details, expect it to
break at any time. Hey, they even change public API without warning (like
mentioned autoRefreshOnExpand).



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