setCurrentItem only sets one item selected. I don't see any method to set more than 1 item selected programmatically, but maybe I'm overlooking something?
Of course, my tree widget is configured to enable multiple selection.
Note that I'm using QTreeWidget, not QTreeView.
Use setSelectionMode:
treeWidget->setSelectionMode(QAbstractItemView::MultiSelection);
And on the items you can use setSelected:
treeWidgetItem->setSelected(true);
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