1 files changed, 33 insertions, 20 deletions

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index 58395f5f20..096be63c7d 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -1272,37 +1272,40 @@ void QGraphicsItemPrivate::setParentItemHelper(QGraphicsItem *newParent, const Q
 
     Returns the bounding rect of this item's children (excluding itself).
 */
-void QGraphicsItemPrivate::childrenBoundingRectHelper(QTransform *x, QRectF *rect, bool doClip)
+void QGraphicsItemPrivate::childrenBoundingRectHelper(QTransform *x, QRectF *rect, QGraphicsItem *topMostEffectItem)
 {
     Q_Q(QGraphicsItem);
 
     QRectF childrenRect;
     QRectF *result = rect;
     rect = &childrenRect;
+    const bool setTopMostEffectItem = !topMostEffectItem;
 
     for (int i = 0; i < children.size(); ++i) {
         QGraphicsItem *child = children.at(i);
         QGraphicsItemPrivate *childd = child->d_ptr.data();
+        if (setTopMostEffectItem)
+            topMostEffectItem = child;
         bool hasPos = !childd->pos.isNull();
         if (hasPos || childd->transformData) {
             // COMBINE
             QTransform matrix = childd->transformToParent();
             if (x)
                 matrix *= *x;
-            *rect |= matrix.mapRect(child->d_ptr->effectiveBoundingRect());
+            *rect |= matrix.mapRect(child->d_ptr->effectiveBoundingRect(topMostEffectItem));
             if (!childd->children.isEmpty())
-                childd->childrenBoundingRectHelper(&matrix, rect);
+                childd->childrenBoundingRectHelper(&matrix, rect, topMostEffectItem);
         } else {
             if (x)
-                *rect |= x->mapRect(child->d_ptr->effectiveBoundingRect());
+                *rect |= x->mapRect(child->d_ptr->effectiveBoundingRect(topMostEffectItem));
             else
-                *rect |= child->d_ptr->effectiveBoundingRect();
+                *rect |= child->d_ptr->effectiveBoundingRect(topMostEffectItem);
             if (!childd->children.isEmpty())
-                childd->childrenBoundingRectHelper(x, rect);
+                childd->childrenBoundingRectHelper(x, rect, topMostEffectItem);
         }
     }
 
-    if (doClip && (flags & QGraphicsItem::ItemClipsChildrenToShape)){
+    if (flags & QGraphicsItem::ItemClipsChildrenToShape){
         if (x)
             *rect &= x->mapRect(q->boundingRect());
         else
@@ -1870,6 +1873,10 @@ void QGraphicsItem::setFlags(GraphicsItemFlags flags)
         // Item children clipping changes. Propagate the ancestor flag to
         // all children.
         d_ptr->updateAncestorFlag(ItemClipsChildrenToShape);
+        // The childrenBoundingRect is clipped to the boundingRect in case of ItemClipsChildrenToShape,
+        // which means we have to invalidate the cached childrenBoundingRect whenever this flag changes.
+        d_ptr->dirtyChildrenBoundingRect = 1;
+        d_ptr->markParentDirty(true);
     }
 
     if ((flags & ItemIgnoresTransformations) != (oldFlags & ItemIgnoresTransformations)) {
@@ -2800,6 +2807,8 @@ QRectF QGraphicsItemPrivate::effectiveBoundingRect(const QRectF &rect) const
     Q_Q(const QGraphicsItem);
     QGraphicsEffect *effect = graphicsEffect;
     if (scene && effect && effect->isEnabled()) {
+        if (scene->d_func()->views.isEmpty())
+            return effect->boundingRectFor(rect);
         QRectF sceneRect = q->mapRectToScene(rect);
         QRectF sceneEffectRect;
         foreach (QGraphicsView *view, scene->views()) {
@@ -2823,12 +2832,12 @@ QRectF QGraphicsItemPrivate::effectiveBoundingRect(const QRectF &rect) const
 
     \sa boundingRect()
 */
-QRectF QGraphicsItemPrivate::effectiveBoundingRect() const
+QRectF QGraphicsItemPrivate::effectiveBoundingRect(QGraphicsItem *topMostEffectItem) const
 {
 #ifndef QT_NO_GRAPHICSEFFECT
     Q_Q(const QGraphicsItem);
     QRectF brect = effectiveBoundingRect(q_ptr->boundingRect());
-    if (ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)
+    if (ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren || topMostEffectItem == q)
         return brect;
 
     const QGraphicsItem *effectParent = parent;
@@ -2839,8 +2848,10 @@ QRectF QGraphicsItemPrivate::effectiveBoundingRect() const
             const QRectF effectRectInParentSpace = effectParent->d_ptr->effectiveBoundingRect(brectInParentSpace);
             brect = effectParent->mapRectToItem(q, effectRectInParentSpace);
         }
-        if (effectParent->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)
+        if (effectParent->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren
+            || topMostEffectItem == effectParent) {
             return brect;
+        }
         effectParent = effectParent->d_ptr->parent;
     }
 
@@ -4715,7 +4726,7 @@ QRectF QGraphicsItem::childrenBoundingRect() const
         return d_ptr->childrenBoundingRect;
 
     d_ptr->childrenBoundingRect = QRectF();
-    d_ptr->childrenBoundingRectHelper(0, &d_ptr->childrenBoundingRect);
+    d_ptr->childrenBoundingRectHelper(0, &d_ptr->childrenBoundingRect, 0);
     d_ptr->dirtyChildrenBoundingRect = 0;
     return d_ptr->childrenBoundingRect;
 }
@@ -7676,6 +7687,14 @@ QGraphicsObject *QGraphicsItemPrivate::children_at(QDeclarativeListProperty<QGra
         return 0;
 }
 
+void QGraphicsItemPrivate::children_clear(QDeclarativeListProperty<QGraphicsObject> *list)
+{
+    QGraphicsItemPrivate *d = QGraphicsItemPrivate::get(static_cast<QGraphicsObject *>(list->object));
+    int childCount = d->children.count();
+    for (int index = 0; index < childCount; index++)
+        QGraphicsItemPrivate::get(d->children.at(0))->setParentItemHelper(0, /*newParentVariant=*/0, /*thisPointerVariant=*/0);
+}
+
 /*!
     Returns a list of this item's children.
 
@@ -7689,7 +7708,7 @@ QDeclarativeListProperty<QGraphicsObject> QGraphicsItemPrivate::childrenList()
     if (isObject) {
         QGraphicsObject *that = static_cast<QGraphicsObject *>(q);
         return QDeclarativeListProperty<QGraphicsObject>(that, &children, children_append,
-                                                         children_count, children_at);
+                                                         children_count, children_at, children_clear);
     } else {
         //QGraphicsItem is not supported for this property
         return QDeclarativeListProperty<QGraphicsObject>();
@@ -11166,14 +11185,8 @@ QRectF QGraphicsItemEffectSourcePrivate::boundingRect(Qt::CoordinateSystem syste
     }
 
     QRectF rect = item->boundingRect();
-    if (!item->d_ptr->children.isEmpty()) {
-        if (dirtyChildrenBoundingRect) {
-            childrenBoundingRect = QRectF();
-            item->d_ptr->childrenBoundingRectHelper(0, &childrenBoundingRect, true);
-            dirtyChildrenBoundingRect = false;
-        }
-        rect |= childrenBoundingRect;
-    }
+    if (!item->d_ptr->children.isEmpty())
+        rect |= item->childrenBoundingRect();
 
     if (deviceCoordinates) {
         Q_ASSERT(info->painter);