Flickable: don't react to any mouse button other than the left

In case of mouse "chording", ignore all other buttons.

Fixes: QTBUG-96909
Change-Id: Ib091b271390c5b4e3aafbbe24d2dc7b6f08db175
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
(cherry picked from commit f91aa3b4d8ae7bfba65a8252099ded3b428f7acf)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 65 insertions, 0 deletions

diff --git a/tests/auto/quick/qquickflickable/data/dragon.qml b/tests/auto/quick/qquickflickable/data/dragon.qml
new file mode 100644
index 0000000000..b82477453b
--- /dev/null
+++ b/tests/auto/quick/qquickflickable/data/dragon.qml
@@ -0,0 +1,15 @@
+import QtQuick 2.12
+
+Flickable {
+    id: flick
+    width: 320
+    height: 320
+    contentWidth: 500
+    contentHeight: 500
+    Text {
+        anchors.centerIn: parent
+        font.pixelSize: 50
+        text: "🐉"
+        color: flick.dragging ? "orange" : "grey"
+    }
+}
diff --git a/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp b/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
index 57c9dda230..2146836048 100644
--- a/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
+++ b/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
@@ -205,6 +205,8 @@ private slots:
     void synchronousDrag();
     void visibleAreaBinding();
     void parallelTouch();
+    void ignoreNonLeftMouseButtons();
+    void ignoreNonLeftMouseButtons_data();
 
 private:
     void flickWithTouch(QQuickWindow *window, const QPoint &from, const QPoint &to);
@@ -2649,6 +2651,54 @@ void tst_qquickflickable::parallelTouch() // QTBUG-30840
     QTRY_VERIFY(!flickable2->isMoving());
 }
 
+void tst_qquickflickable::ignoreNonLeftMouseButtons() // QTBUG-96909
+{
+    QFETCH(Qt::MouseButton, otherButton);
+    const int threshold = qApp->styleHints()->startDragDistance();
+    QQuickView view;
+    view.setSource(testFileUrl("dragon.qml"));
+    view.show();
+    view.requestActivate();
+    QQuickFlickable *flickable = static_cast<QQuickFlickable *>(view.rootObject());
+    QSignalSpy dragSpy(flickable, &QQuickFlickable::draggingChanged);
+
+    // Drag with left button
+    QPoint p1(100, 100);
+    moveAndPress(&view, p1);
+    for (int i = 0; i < 8; ++i) {
+        p1 -= QPoint(threshold, threshold);
+        QTest::mouseMove(&view, p1, 50);
+    }
+    QVERIFY(flickable->isDragging());
+    QCOMPARE(dragSpy.count(), 1);
+
+    // Press other button too, then release left button: dragging changes to false
+    QTest::mousePress(&view, otherButton);
+    QTest::mouseRelease(&view, Qt::LeftButton);
+    QTRY_COMPARE(flickable->isDragging(), false);
+    QCOMPARE(dragSpy.count(), 2);
+
+    // Drag further with the other button held: Flickable ignores it
+    for (int i = 0; i < 8; ++i) {
+        p1 -= QPoint(threshold, threshold);
+        QTest::mouseMove(&view, p1, 50);
+    }
+    QCOMPARE(flickable->isDragging(), false);
+    QCOMPARE(dragSpy.count(), 2);
+
+    // Release other button: nothing happens
+    QTest::mouseRelease(&view, otherButton);
+    QCOMPARE(dragSpy.count(), 2);
+}
+
+void tst_qquickflickable::ignoreNonLeftMouseButtons_data()
+{
+    QTest::addColumn<Qt::MouseButton>("otherButton");
+
+    QTest::newRow("right") << Qt::RightButton;
+    QTest::newRow("middle") << Qt::MiddleButton;
+}
+
 QTEST_MAIN(tst_qquickflickable)
 
 #include "tst_qquickflickable.moc"