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Editable Diff window needs a way to enable undo/redo functionality in its editable diff pane. The pane is custom, NbDocument is from EditorCookie.
A side note: I noticed there is getUndoRedo() method in TopComponent. However, I have one DiffTopComponent that can contain many editor panes with editable documents each one with its own UndoRedo instance ... and I am not sure that delegating will be of any help here.
Update: Undo delegation works with one exception: I have no way of telling the UndoAction that my UndoRedo support has changed for my TopComponent.
Re. delegation. Create a wrapper UndoRedo, delegate in it, when delegate changes, fire change event. Should be simple, UndoRedo is an interface. Re. actual problem of getting UndoRedo for a Document, I like more an more to use document.getProperty("org.openide.awt.UndoRedo") and making sure that our CloneableEditorSupport documents have this property correctly assigned.
Deleting dependency and tracking independently.
Reassigning to new module owner mslama.