diff -r ef0373b55136 -r 758a864f9613 src/gui/graphicsview/qgraphicsscene.cpp
--- a/src/gui/graphicsview/qgraphicsscene.cpp	Fri Sep 17 08:34:18 2010 +0300
+++ b/src/gui/graphicsview/qgraphicsscene.cpp	Mon Oct 04 01:19:32 2010 +0300
@@ -831,6 +831,11 @@
 #endif //QT_NO_IM
     }
 
+    // This handles the case that the item has been removed from the
+    // scene in response to the FocusOut event.
+    if (item && item->scene() != q)
+        item = 0;
+
     if (item)
         focusItem = item;
     updateInputMethodSensitivityInViews();
@@ -1069,7 +1074,7 @@
 /*!
     Returns all items for the screen position in \a event.
 */
-QList<QGraphicsItem *> QGraphicsScenePrivate::itemsAtPosition(const QPoint &screenPos,
+QList<QGraphicsItem *> QGraphicsScenePrivate::itemsAtPosition(const QPoint &/*screenPos*/,
                                                               const QPointF &scenePos,
                                                               QWidget *widget) const
 {
@@ -1078,16 +1083,12 @@
     if (!view)
         return q->items(scenePos, Qt::IntersectsItemShape, Qt::DescendingOrder, QTransform());
 
-    const QRectF pointRect(QPointF(widget->mapFromGlobal(screenPos)), QSizeF(1, 1));
+    const QRectF pointRect(scenePos, QSizeF(1, 1));
     if (!view->isTransformed())
         return q->items(pointRect, Qt::IntersectsItemShape, Qt::DescendingOrder);
 
     const QTransform viewTransform = view->viewportTransform();
-    if (viewTransform.type() <= QTransform::TxScale) {
-        return q->items(viewTransform.inverted().mapRect(pointRect), Qt::IntersectsItemShape,
-                        Qt::DescendingOrder, viewTransform);
-    }
-    return q->items(viewTransform.inverted().map(pointRect), Qt::IntersectsItemShape,
+    return q->items(pointRect, Qt::IntersectsItemShape,
                     Qt::DescendingOrder, viewTransform);
 }
 
@@ -5121,7 +5122,9 @@
                 q->update(itemBoundingRect.translated(item->d_ptr->sceneTransform.dx(),
                                                       item->d_ptr->sceneTransform.dy()));
             } else {
-                q->update(item->d_ptr->sceneTransform.mapRect(itemBoundingRect));
+                QRectF rect = item->d_ptr->sceneTransform.mapRect(itemBoundingRect);
+                if (!rect.isEmpty())
+                    q->update(rect);
             }
         } else {
             QRectF dirtyRect;
@@ -5735,16 +5738,11 @@
             }
 
             if (sceneTouchEvent->deviceType() == QTouchEvent::TouchScreen) {
-                // on touch-screens, combine this touch point with the closest one we find if it
-                // is a a direct descendent or ancestor (
+                // on touch-screens, combine this touch point with the closest one we find
                 int closestTouchPointId = findClosestTouchPointId(touchPoint.scenePos());
                 QGraphicsItem *closestItem = itemForTouchPointId.value(closestTouchPointId);
-                if (!item
-                    || (closestItem
-                        && (item->isAncestorOf(closestItem)
-                            || closestItem->isAncestorOf(item)))) {
+                if (!item || (closestItem && cachedItemsUnderMouse.contains(closestItem)))
                     item = closestItem;
-                }
             }
             if (!item)
                 continue;