As docs say, it's just a synonym for a QList containing QModelIndexes.
All view's have a selection model which keeps track of selected items.
There might be multiple selected "items", so the selection cannot just be a single "item".
So the view's selection model needs to return a list of selected indexes.
QModelIndexList QItemSelectionModel::selectedIndexes () const
Returns a list of all selected model item indexes. The list contains no duplicates, and is not sorted.
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