3 files changed, 58 insertions, 4 deletions

diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index abd0231b00..ba14a06af4 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -4275,15 +4275,16 @@ void QApplicationPrivate::cleanupMultitouch_sys()
 {
 }
 
-QWidget *QApplicationPrivate::findClosestTouchPointTarget(QTouchDevice *device, const QPointF &screenPos)
+QWidget *QApplicationPrivate::findClosestTouchPointTarget(QTouchDevice *device, const QTouchEvent::TouchPoint &touchPoint)
 {
+    const QPointF screenPos = touchPoint.screenPos();
     int closestTouchPointId = -1;
     QObject *closestTarget = 0;
     qreal closestDistance = qreal(0.);
     QHash<ActiveTouchPointsKey, ActiveTouchPointsValue>::const_iterator it = activeTouchPoints.constBegin(),
             ite = activeTouchPoints.constEnd();
     while (it != ite) {
-        if (it.key().device == device) {
+        if (it.key().device == device && it.key().touchPointId != touchPoint.id()) {
             const QTouchEvent::TouchPoint &touchPoint = it->touchPoint;
             qreal dx = screenPos.x() - touchPoint.screenPos().x();
             qreal dy = screenPos.y() - touchPoint.screenPos().y();
@@ -4339,7 +4340,7 @@ bool QApplicationPrivate::translateRawTouchEvent(QWidget *window,
             }
 
             if (device->type() == QTouchDevice::TouchScreen) {
-                QWidget *closestWidget = d->findClosestTouchPointTarget(device, touchPoint.screenPos());
+                QWidget *closestWidget = d->findClosestTouchPointTarget(device, touchPoint);
                 QWidget *widget = static_cast<QWidget *>(target.data());
                 if (closestWidget
                         && (widget->isAncestorOf(closestWidget) || closestWidget->isAncestorOf(widget))) {
diff --git a/src/widgets/kernel/qapplication_p.h b/src/widgets/kernel/qapplication_p.h
index 7d97235c66..7f76d1ba97 100644
--- a/src/widgets/kernel/qapplication_p.h
+++ b/src/widgets/kernel/qapplication_p.h
@@ -280,7 +280,7 @@ public:
     void initializeMultitouch_sys();
     void cleanupMultitouch();
     void cleanupMultitouch_sys();
-    QWidget *findClosestTouchPointTarget(QTouchDevice *device, const QPointF &screenPos);
+    QWidget *findClosestTouchPointTarget(QTouchDevice *device, const QTouchEvent::TouchPoint &touchPoint);
     void appendTouchPoint(const QTouchEvent::TouchPoint &touchPoint);
     void removeTouchPoint(int touchPointId);
     static bool translateRawTouchEvent(QWidget *widget,
diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index ae6d62c332..717039d64e 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -435,6 +435,7 @@ private slots:
     void grabKeyboard();
 
     void touchEventSynthesizedMouseEvent();
+    void touchUpdateOnNewTouch();
 
     void styleSheetPropagation();
 
@@ -9763,6 +9764,9 @@ class TouchMouseWidget : public QWidget {
 public:
     explicit TouchMouseWidget(QWidget *parent = 0)
         : QWidget(parent),
+          m_touchBeginCount(0),
+          m_touchUpdateCount(0),
+          m_touchEndCount(0),
           m_touchEventCount(0),
           m_acceptTouch(false),
           m_mouseEventCount(0),
@@ -9789,6 +9793,12 @@ protected:
         case QEvent::TouchBegin:
         case QEvent::TouchUpdate:
         case QEvent::TouchEnd:
+            if (e->type() == QEvent::TouchBegin)
+                ++m_touchBeginCount;
+            else if (e->type() == QEvent::TouchUpdate)
+                ++m_touchUpdateCount;
+            else if (e->type() == QEvent::TouchEnd)
+                ++m_touchEndCount;
             ++m_touchEventCount;
             if (m_acceptTouch)
                 e->accept();
@@ -9813,6 +9823,9 @@ protected:
     }
 
 public:
+    int m_touchBeginCount;
+    int m_touchUpdateCount;
+    int m_touchEndCount;
     int m_touchEventCount;
     bool m_acceptTouch;
     int m_mouseEventCount;
@@ -9933,6 +9946,46 @@ void tst_QWidget::touchEventSynthesizedMouseEvent()
     }
 }
 
+void tst_QWidget::touchUpdateOnNewTouch()
+{
+    QTouchDevice *device = new QTouchDevice;
+    device->setType(QTouchDevice::TouchScreen);
+    QWindowSystemInterface::registerTouchDevice(device);
+
+    TouchMouseWidget widget;
+    widget.setAcceptTouch(true);
+    QVBoxLayout *layout = new QVBoxLayout;
+    layout->addWidget(new QWidget);
+    widget.setLayout(layout);
+    widget.show();
+
+    QWindow* window = widget.windowHandle();
+    QVERIFY(QTest::qWaitForWindowExposed(window));
+    QCOMPARE(widget.m_touchBeginCount, 0);
+    QCOMPARE(widget.m_touchUpdateCount, 0);
+    QCOMPARE(widget.m_touchEndCount, 0);
+    QTest::touchEvent(window, device).press(0, QPoint(20, 20), window);
+    QCOMPARE(widget.m_touchBeginCount, 1);
+    QCOMPARE(widget.m_touchUpdateCount, 0);
+    QCOMPARE(widget.m_touchEndCount, 0);
+    QTest::touchEvent(window, device).move(0, QPoint(25, 25), window);
+    QCOMPARE(widget.m_touchBeginCount, 1);
+    QCOMPARE(widget.m_touchUpdateCount, 1);
+    QCOMPARE(widget.m_touchEndCount, 0);
+    QTest::touchEvent(window, device).stationary(0).press(1, QPoint(40, 40), window);
+    QCOMPARE(widget.m_touchBeginCount, 1);
+    QCOMPARE(widget.m_touchUpdateCount, 2);
+    QCOMPARE(widget.m_touchEndCount, 0);
+    QTest::touchEvent(window, device).stationary(1).release(0, QPoint(25, 25), window);
+    QCOMPARE(widget.m_touchBeginCount, 1);
+    QCOMPARE(widget.m_touchUpdateCount, 3);
+    QCOMPARE(widget.m_touchEndCount, 0);
+    QTest::touchEvent(window, device).release(1, QPoint(40, 40), window);
+    QCOMPARE(widget.m_touchBeginCount, 1);
+    QCOMPARE(widget.m_touchUpdateCount, 3);
+    QCOMPARE(widget.m_touchEndCount, 1);
+}
+
 void tst_QWidget::styleSheetPropagation()
 {
     QTableView tw;