get_selection_in_range

Gets a set containing a set where the values in the range `[position, position + n_items)` match the selected state of the items in that range.

All values outside that range are undefined.

This function is an optimization for get_selection when you are only interested in part of the model's selected state. A common use case is in response to the selection_changed signal.

Parameters:

this	a SelectionModel
position	start of the queired range
n_items	number of items in the queried range

Returns:

A Bitset that matches the selection state for the given state with all other values being undefined. The bitset must not be modified.