tst_QTreeView: Fix UB (invalid downcast, member call)

As reported by UBSan:

  tst_qtreeview.cpp:2187:36: runtime error: downcast of address 0x7ffc15749f20 which does not point to an object of type 'PublicView'
    0x7ffc15749f20: note: object is of type 'QTreeView'

Fix by making the test a friend of QTreeView (and, for
Clang, of QAbstractItemView) instead.

Change-Id: I5b748696ab441a91058f4d45a18bd5ed75a6e560
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/widgets/itemviews/qtreeview.h b/src/widgets/itemviews/qtreeview.h
index 546cc488cb..9257bb66fa 100644
--- a/src/widgets/itemviews/qtreeview.h
+++ b/src/widgets/itemviews/qtreeview.h
@@ -36,6 +36,8 @@
 
 #include <QtWidgets/qabstractitemview.h>
 
+class tst_QTreeView;
+
 QT_BEGIN_NAMESPACE
 
 
@@ -213,6 +215,7 @@ protected:
     void currentChanged(const QModelIndex &current, const QModelIndex &previous) Q_DECL_OVERRIDE;
 
 private:
+    friend class ::tst_QTreeView;
     friend class QAccessibleTable;
     friend class QAccessibleTree;
     friend class QAccessibleTableCell;