From defe418c16e5e79033812752416efa874c70e622 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <stephen.kelly@kdab.com>
Date: Thu, 21 Oct 2010 10:37:46 +0200
Subject: Make sure d->ranges does not have invalid ranges before processing
 it.

Reviewed-by: gabi
Merge-request: 831
---
 src/gui/itemviews/qitemselectionmodel.cpp          | 13 +++++
 .../tst_qitemselectionmodel.cpp                    | 66 ++++++++++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/src/gui/itemviews/qitemselectionmodel.cpp b/src/gui/itemviews/qitemselectionmodel.cpp
index f848321..e69cd65 100644
--- a/src/gui/itemviews/qitemselectionmodel.cpp
+++ b/src/gui/itemviews/qitemselectionmodel.cpp
@@ -1059,6 +1059,19 @@ void QItemSelectionModel::select(const QItemSelection &selection, QItemSelection
 
     // store old selection
     QItemSelection sel = selection;
+    // If d->ranges is non-empty when the source model is reset the persistent indexes
+    // it contains will be invalid. We can't clear them in a modelReset slot because that might already
+    // be too late if another model observer is connected to the same modelReset slot and is invoked first
+    // it might call select() on this selection model before any such QItemSelectionModelPrivate::_q_modelReset() slot
+    // is invoked, so it would not be cleared yet. We clear it invalid ranges in it here.
+    QItemSelection::iterator it = d->ranges.begin();
+    while (it != d->ranges.end()) {
+      if (!it->isValid())
+        it = d->ranges.erase(it);
+      else
+        ++it;
+    }
+
     QItemSelection old = d->ranges;
     old.merge(d->currentSelection, d->currentCommand);
 
diff --git a/tests/auto/qitemselectionmodel/tst_qitemselectionmodel.cpp b/tests/auto/qitemselectionmodel/tst_qitemselectionmodel.cpp
index 3b2a716..8058294 100644
--- a/tests/auto/qitemselectionmodel/tst_qitemselectionmodel.cpp
+++ b/tests/auto/qitemselectionmodel/tst_qitemselectionmodel.cpp
@@ -95,6 +95,8 @@ private slots:
     void QTBUG5671_layoutChangedWithAllSelected();
     void QTBUG2804_layoutChangedTreeSelection();
 
+    void testValidRangesInSelectionsAfterReset();
+
 private:
     QAbstractItemModel *model;
     QItemSelectionModel *selection;
@@ -2353,6 +2355,70 @@ void tst_QItemSelectionModel::QTBUG2804_layoutChangedTreeSelection()
     QCOMPARE(selModel.selectedIndexes().count(), 4);
 }
 
+class SelectionObserver : public QObject
+{
+  Q_OBJECT
+public:
+    SelectionObserver(QAbstractItemModel *model, QObject *parent = 0)
+      : QObject(parent), m_model(model), m_selectionModel(0)
+    {
+        connect(model, SIGNAL(modelReset()), SLOT(modelReset()));
+    }
+
+    void setSelectionModel(QItemSelectionModel *selectionModel)
+    {
+        m_selectionModel = selectionModel;
+        connect(m_selectionModel, SIGNAL(selectionChanged(QItemSelection,QItemSelection)), SLOT(selectionChanged(QItemSelection,QItemSelection)));
+    }
+
+  private slots:
+    void modelReset()
+    {
+        const QModelIndex idx = m_model->index(2, 0);
+        QVERIFY(idx.isValid());
+        m_selectionModel->select(QItemSelection(idx, idx), QItemSelectionModel::Clear);
+    }
+
+    void selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
+    {
+        foreach(const QItemSelectionRange &range, selected)
+            QVERIFY(range.isValid());
+        foreach(const QItemSelectionRange &range, deselected)
+            QVERIFY(range.isValid());
+    }
+
+private:
+    QAbstractItemModel *m_model;
+    QItemSelectionModel *m_selectionModel;
+};
+
+void tst_QItemSelectionModel::testValidRangesInSelectionsAfterReset()
+{
+    QStringListModel model;
+
+    QStringList strings;
+    strings << "one"
+            << "two"
+            << "three"
+            << "four"
+            << "five";
+
+    model.setStringList(strings);
+
+    SelectionObserver observer(&model);
+
+    QItemSelectionModel selectionModel(&model);
+
+    selectionModel.select(QItemSelection(model.index(1, 0), model.index(3, 0)), QItemSelectionModel::Select);
+
+    // Cause d->ranges to contain something.
+    model.insertRows(2, 1);
+
+    observer.setSelectionModel(&selectionModel);
+
+    model.setStringList(strings);
+
+}
 
 QTEST_MAIN(tst_QItemSelectionModel)
 #include "tst_qitemselectionmodel.moc"
-- 
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