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It looks like action org.openide.actions.CloneViewAction is no more used. I haven't found any usage in the repository and it seems to me that for the purpose of cloning documents we have org.netbeans.core.windows.actions.CloneDocumentAction. Feel free to close this issue if I am wrong.
CloneViewAction should be marked as deprecated at first.
Almost all actions in org.openide.actions are or should be useless. There is not much to do about I think.