The `GList` API is no longer used, as containers use the `GListModel` interface.
Fetching the group-from-field or page-from-group is no longer needed as previous users now process the field along with the group they were already using.
Testing Done:
Compiled only.
Reviewed at https://reviews.imfreedom.org/r/2363/
PidginandFinch:ThePimpin' Penguin IM Clients That'reGoodfortheSoul
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