Gets the set containing all currently selected items in the model.
This function may be slow, so if you are only interested in single item, consider using [[email protected]_selected] or if you are only interested in a few, consider [[email protected]_selection_in_range].
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a `GtkSelectionModel` |
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a `GtkBitset` containing all the values currently selected in this. If no items are selected, the bitset is empty. The bitset must not be modified. |