emit layoutAboutToBeChanged timely

layoutAboutToBeChanged must be called before
persistentIndexList as the user might create persistent indexes
as a response to the signal

Fixes: QTBUG-93466
Pick-to: 6.2 5.15
Change-Id: I73c24501f536ef9b6092c3374821497f0a8f0de4
Reviewed-by: David Faure <david.faure@kdab.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/auto/gui/itemmodels/qstandarditemmodel/tst_qstandarditemmodel.cpp b/tests/auto/gui/itemmodels/qstandarditemmodel/tst_qstandarditemmodel.cpp
index 7fc2c473de..7758a5d5cc 100644
--- a/tests/auto/gui/itemmodels/qstandarditemmodel/tst_qstandarditemmodel.cpp
+++ b/tests/auto/gui/itemmodels/qstandarditemmodel/tst_qstandarditemmodel.cpp
@@ -138,6 +138,7 @@ private slots:
     void taskQTBUG_45114_setItemData();
     void setItemPersistentIndex();
     void signalsOnTakeItem();
+    void createPersistentOnLayoutAboutToBeChanged();
 private:
     QStandardItemModel *m_model = nullptr;
     QPersistentModelIndex persistent;
@@ -1785,5 +1786,40 @@ void tst_QStandardItemModel::signalsOnTakeItem() // QTBUG-89145
     QCOMPARE(m.index(1, 0).data(), QVariant());
 }
 
+void tst_QStandardItemModel::createPersistentOnLayoutAboutToBeChanged() // QTBUG-93466
+{
+    QStandardItemModel model;
+    QAbstractItemModelTester mTester(&model, nullptr);
+    model.insertColumn(0);
+    QCOMPARE(model.columnCount(), 1);
+    model.insertRows(0, 3);
+    for (int row = 0; row < 3; ++row)
+        model.setData(model.index(row, 0), row);
+    QList<QPersistentModelIndex> idxList;
+    QSignalSpy layoutAboutToBeChangedSpy(&model, &QAbstractItemModel::layoutAboutToBeChanged);
+    QSignalSpy layoutChangedSpy(&model, &QAbstractItemModel::layoutChanged);
+    connect(&model, &QAbstractItemModel::layoutAboutToBeChanged, this, [&idxList, &model](){
+        idxList.clear();
+        for (int row = 0; row < 3; ++row)
+            idxList << QPersistentModelIndex(model.index(row, 0));
+    });
+    connect(&model, &QAbstractItemModel::layoutChanged, this, [&idxList](){
+        QCOMPARE(idxList.size(), 3);
+        QCOMPARE(idxList.at(0).row(), 1);
+        QCOMPARE(idxList.at(0).column(), 0);
+        QCOMPARE(idxList.at(0).data().toInt(), 0);
+        QCOMPARE(idxList.at(1).row(), 0);
+        QCOMPARE(idxList.at(1).column(), 0);
+        QCOMPARE(idxList.at(1).data().toInt(), -1);
+        QCOMPARE(idxList.at(2).row(), 2);
+        QCOMPARE(idxList.at(2).column(), 0);
+        QCOMPARE(idxList.at(2).data().toInt(), 2);
+    });
+    model.setData(model.index(1, 0), -1);
+    model.sort(0);
+    QCOMPARE(layoutAboutToBeChangedSpy.size(), 1);
+    QCOMPARE(layoutChangedSpy.size(), 1);
+}
+
 QTEST_MAIN(tst_QStandardItemModel)
 #include "tst_qstandarditemmodel.moc"