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I am not sure, if this is the right component, as the request is for jface... Anyway: I am using the org.eclipse.jface.preference.ListEditor. I have written a subclass in which am implementing the required methods, but it would be very useful for me to have a possibility to enable/disable the Add button, depending on the items in the list (E.g. I have just 5 values which can be added to the list. To achive this, I am opening a dialog when the add button is pressed. But I cannot enable / disable the add button if all elements are in the list. Also I don't get a message if an item was removed) It would be great to have accesor-methods for the buttons and the elements in the list.
There are currently no plans to work on this however I would be happy to look over a contribution