According to https://doc.qt.io/qt-5/qitemselectionmodel.html#columnIntersectsSelection, the function "Returns true if there are any items selected in the column with the given parent.". However the actual implementation https://code.woboq.org/qt5/qtbase/src/corelib/itemmodels/qitemselectionmodel.cpp.html

does not test whether the items have the specified parent.

QTBUG-22370 covers the exact same bug except with rowIntersectsSelection, and that bug was fixed for 5.0 in c1df856d6b7. However there has been no equivalent fix to columnIntersectsSelection.