idlelib.tabbedpages.TabbedPageSet is a custom widget only used for the tabbed config dialog. bpo-30781 converted to using tkinter.ttk.Notebook. The latter has proven to be an improvement and the former has no other use, nor would I recommend its use. Time to delete the file.
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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