[ui] DelegateSelectionBox: Updated selection to refer to the actual item rather than the loader delegate

Author: waaake

meshroom/ui/qml/Controls/DelegateSelectionBox.qml

@@ -21,7 +21,7 @@ SelectionBox {
         let selectedIndices = [];
         const mappedSelectionRect = mapToItem(container, selectionRect);
         for (var i = 0; i < modelInstantiator.count; ++i) {
-            const delegate = modelInstantiator.itemAt(i);
+            const delegate = modelInstantiator.itemAt(i).item;
             const delegateRect = Qt.rect(delegate.x, delegate.y, delegate.width, delegate.height);
             if (Geom2D.rectRectIntersect(mappedSelectionRect, delegateRect)) {
                 selectedIndices.push(i);