While it’s easier to execute bundle items from a text view, it doesn’t work when saving documents that are not in the current text view.
This is an intermediate refactoring step — handling should (likely) end up in the DocumentSaveHelper class, but we need to improve dealing with command execution first, and by having the callback piggyback on the normal performBundleItem: method, we (temporarily) limit the code which use the command execution API, making refactoring easier.
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