With the valuable support from Johan, I'm migrating my Grafoscopio
interactive notebook project to last Pharo 5 / Moose 6 and its getting
in a really good shape (see screenshot below). Now I would like to
migrate the auto-update functionality when a node is changed. When text
nodes is easy, but for code nodes, I need to know when a playground has
changed, to send the proper message to the tree, updating its contents.
How to know when a playground contents has changed?
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