Allow proxy models access to the parent-child hierarchy of source

As discussed in the related bug report, the current way proxy models
access the parent-child hierarchy of the source model requires modifying
Qt sources. This changes adds a method to allow easy implementation
of this common feature to proxy model subclasses.

Fixes: QTBUG-83911
Change-Id: Ic88d40c13c2be7b6b44fcc58118bac471a11da95
Reviewed-by: David Faure <david.faure@kdab.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/src/corelib/itemmodels/qtransposeproxymodel.cpp b/src/corelib/itemmodels/qtransposeproxymodel.cpp
index 83a86d1a97..899f93c2a5 100644
--- a/src/corelib/itemmodels/qtransposeproxymodel.cpp
+++ b/src/corelib/itemmodels/qtransposeproxymodel.cpp
@@ -49,9 +49,8 @@ QModelIndex QTransposeProxyModelPrivate::uncheckedMapToSource(const QModelIndex
 {
     if (!model || !proxyIndex.isValid())
         return QModelIndex();
-    if (proxyIndex.internalPointer())
-        return model->createIndex(proxyIndex.column(), proxyIndex.row(), proxyIndex.internalPointer());
-    return model->index(proxyIndex.column(), proxyIndex.row());
+    Q_Q(const QTransposeProxyModel);
+    return q->createSourceIndex(proxyIndex.column(), proxyIndex.row(), proxyIndex.internalPointer());
 }
 
 QModelIndex QTransposeProxyModelPrivate::uncheckedMapFromSource(const QModelIndex &sourceIndex) const