QListView: Catch stack overflow on mutual scrollbar calculation.

Task-number: QTBUG-39902
Change-Id: Ie850371098070e8ce485d5cb122aa89c18d97359
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/auto/widgets/itemviews/qlistview/tst_qlistview.cpp b/tests/auto/widgets/itemviews/qlistview/tst_qlistview.cpp
index b36b5aef8a..bb05db0b15 100644
--- a/tests/auto/widgets/itemviews/qlistview/tst_qlistview.cpp
+++ b/tests/auto/widgets/itemviews/qlistview/tst_qlistview.cpp
@@ -155,6 +155,7 @@ private slots:
     void spacing();
     void testScrollToWithHidden();
     void testViewOptions();
+    void taskQTBUG_39902_mutualScrollBars();
 };
 
 // Testing get/set functions
@@ -2355,5 +2356,29 @@ void tst_QListView::testViewOptions()
     QCOMPARE(options.decorationPosition, QStyleOptionViewItem::Top);
 }
 
+void tst_QListView::taskQTBUG_39902_mutualScrollBars()
+{
+    QWidget window;
+    window.resize(400, 300);
+    QListView *view = new QListView(&window);
+    QStandardItemModel model(200, 1);
+    const QSize itemSize(100, 20);
+    for (int i = 0; i < model.rowCount(); ++i)
+        model.setData(model.index(i, 0), itemSize, Qt::SizeHintRole);
+    view->setModel(&model);
+
+    window.show();
+    QVERIFY(QTest::qWaitForWindowExposed(&window));
+    // make sure QListView is done with layouting the items (1/10 sec, like QListView)
+    QTest::qWait(100);
+
+    model.setRowCount(2);
+    for (int i = 0; i < model.rowCount(); ++i)
+        model.setData(model.index(i, 0), itemSize, Qt::SizeHintRole);
+    view->resize(itemSize.width() + view->frameWidth() * 2, model.rowCount() * itemSize.height() + view->frameWidth() * 2);
+    // this will end up in a stack overflow, if QTBUG-39902 is not fixed
+    QTest::qWait(100);
+}
+
 QTEST_MAIN(tst_QListView)
 #include "tst_qlistview.moc"