QSortFilterProxyModel: Warning or assert failure

A mapping was being created after QStandardItem::dataChanged() signal,
even though one of the item's ancestors was being filtered out by the
filter proxy. This let the QSortFilterProxyModel in a unstable state,
triggering warnings and failing asserts. This patch partialy reverts
commit f4bce41c10988.

Auto-test included.

Reviewed-by: mbm
Task-number: QTBUG-10287

2 files changed, 62 insertions, 1 deletions

diff --git a/src/gui/itemviews/qsortfilterproxymodel.cpp b/src/gui/itemviews/qsortfilterproxymodel.cpp
index dce5c6a..b12cd45 100644
--- a/src/gui/itemviews/qsortfilterproxymodel.cpp
+++ b/src/gui/itemviews/qsortfilterproxymodel.cpp
@@ -1099,7 +1099,7 @@ void QSortFilterProxyModelPrivate::_q_sourceDataChanged(const QModelIndex &sourc
     if (!source_top_left.isValid() || !source_bottom_right.isValid())
         return;
     QModelIndex source_parent = source_top_left.parent();
-    IndexMap::const_iterator it = create_mapping(source_parent);
+    IndexMap::const_iterator it = source_index_mapping.find(source_parent);
     if (it == source_index_mapping.constEnd()) {
         // Don't care, since we don't have mapping for this index
         return;
diff --git a/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp b/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
index 2339b21..992c95e 100644
--- a/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
+++ b/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
@@ -138,6 +138,7 @@ private slots:
     void taskQTBUG_6205_doubleProxySelectionSetSourceModel();
     void taskQTBUG_7537_appearsAndSort();
     void taskQTBUG_7716_unnecessaryDynamicSorting();
+    void taskQTBUG_10287_unnecessaryMapCreation();
 
     void testMultipleProxiesWithSelection();
 
@@ -3038,5 +3039,65 @@ void tst_QSortFilterProxyModel::testMultipleProxiesWithSelection()
 
 }
 
+class Model10287 : public QStandardItemModel
+{
+    Q_OBJECT
+
+public:
+    Model10287(QObject *parent = 0)
+        : QStandardItemModel(0, 1, parent)
+    {
+        parentItem = new QStandardItem("parent");
+        parentItem->setData(false, Qt::UserRole);
+        appendRow(parentItem);
+
+        childItem = new QStandardItem("child");
+        childItem->setData(true, Qt::UserRole);
+        parentItem->appendRow(childItem);
+
+        childItem2 = new QStandardItem("child2");
+        childItem2->setData(true, Qt::UserRole);
+        parentItem->appendRow(childItem2);
+    }
+
+    void removeChild()
+    {
+        childItem2->setData(false, Qt::UserRole);
+        parentItem->removeRow(0);
+    }
+
+private:
+    QStandardItem *parentItem, *childItem, *childItem2;
+};
+
+class Proxy10287 : public QSortFilterProxyModel
+{
+    Q_OBJECT
+
+public:
+    Proxy10287(QAbstractItemModel *model, QObject *parent = 0)
+        : QSortFilterProxyModel(parent)
+    {
+        setSourceModel(model);
+        setDynamicSortFilter(true);
+    }
+
+protected:
+    virtual bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
+    {
+        // Filter based on UserRole in model
+        QModelIndex i = sourceModel()->index(source_row, 0, source_parent);
+        return i.data(Qt::UserRole).toBool();
+    }
+};
+
+void tst_QSortFilterProxyModel::taskQTBUG_10287_unnecessaryMapCreation()
+{
+    Model10287 m;
+    Proxy10287 p(&m);
+    m.removeChild();
+    // No assert failure, it passes.
+}
+
 QTEST_MAIN(tst_QSortFilterProxyModel)
 #include "tst_qsortfilterproxymodel.moc"