5 files changed, 15 insertions, 4 deletions
diff --git a/src/gui/graphicsview/qgraphicseffect.cpp b/src/gui/graphicsview/qgraphicseffect.cpp
index 6025537..9196ee0 100644
--- a/src/gui/graphicsview/qgraphicseffect.cpp
+++ b/src/gui/graphicsview/qgraphicseffect.cpp
@@ -204,8 +204,8 @@ void QGraphicsEffect::updateBoundingRect()
         d->source->update();
 }
 
-void QGraphicsEffect::sourceChanged(QGraphicsEffectSource *)
-{}
+void QGraphicsEffect::sourceChanged(QGraphicsEffectSource *) {}
+void QGraphicsEffect::sourceBoundingRectChanged() {}
 
 QGraphicsGrayscaleEffect::QGraphicsGrayscaleEffect()
     : QGraphicsEffect(*new QGraphicsGrayscaleEffectPrivate)
diff --git a/src/gui/graphicsview/qgraphicseffect.h b/src/gui/graphicsview/qgraphicseffect.h
index 929ea19..37b6d23 100644
--- a/src/gui/graphicsview/qgraphicseffect.h
+++ b/src/gui/graphicsview/qgraphicseffect.h
@@ -117,6 +117,7 @@ protected:
     QGraphicsEffect(QGraphicsEffectPrivate &d);
     virtual void draw(QPainter *painter, QGraphicsEffectSource *source) = 0;
     virtual void sourceChanged(QGraphicsEffectSource *newSource);
+    virtual void sourceBoundingRectChanged();
     void updateBoundingRect();
 
 private:
diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index 976ffa3..9700965 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -6661,6 +6661,7 @@ void QGraphicsItem::prepareGeometryChange()
         d_ptr->scene->d_func()->dirtyGrowingItemsBoundingRect = true;
         d_ptr->geometryChanged = 1;
         d_ptr->paintedViewBoundingRectsNeedRepaint = 1;
+        d_ptr->notifyBoundingRectChanged = !d_ptr->inSetPosHelper;
 
         QGraphicsScenePrivate *scenePrivate = d_ptr->scene->d_func();
         scenePrivate->index->prepareBoundingRectChange(this);
@@ -6684,8 +6685,11 @@ void QGraphicsItem::prepareGeometryChange()
     }
 
     QGraphicsItem *parent = this;
-    while ((parent = parent->d_ptr->parent))
+    while ((parent = parent->d_ptr->parent)) {
         parent->d_ptr->dirtyChildrenBoundingRect = 1;
+        // ### Only do this if the parent's effect applies to the entire subtree.
+        parent->d_ptr->notifyBoundingRectChanged = 1;
+    }
 
     if (d_ptr->inSetPosHelper)
         return;
diff --git a/src/gui/graphicsview/qgraphicsitem_p.h b/src/gui/graphicsview/qgraphicsitem_p.h
index 8b7f5b5..c01ee1a 100644
--- a/src/gui/graphicsview/qgraphicsitem_p.h
+++ b/src/gui/graphicsview/qgraphicsitem_p.h
@@ -164,6 +164,7 @@ public:
         acceptedTouchBeginEvent(0),
         filtersDescendantEvents(0),
         sceneTransformTranslateOnly(0),
+        notifyBoundingRectChanged(0),
         globalStackingOrder(-1),
         q_ptr(0)
     {
@@ -457,7 +458,8 @@ public:
     quint32 acceptedTouchBeginEvent : 1;
     quint32 filtersDescendantEvents : 1;
     quint32 sceneTransformTranslateOnly : 1;
-    quint32 unused : 6; // feel free to use
+    quint32 notifyBoundingRectChanged : 1;
+    quint32 unused : 5; // feel free to use
 
     // Optional stacking order
     int globalStackingOrder;
diff --git a/src/gui/graphicsview/qgraphicsscene_p.h b/src/gui/graphicsview/qgraphicsscene_p.h
index 56e6224..6223101 100644
--- a/src/gui/graphicsview/qgraphicsscene_p.h
+++ b/src/gui/graphicsview/qgraphicsscene_p.h
@@ -227,10 +227,14 @@ public:
         item->d_ptr->fullUpdatePending = 0;
         item->d_ptr->ignoreVisible = 0;
         item->d_ptr->ignoreOpacity = 0;
+        const bool notifyEffect = item->d_ptr->notifyBoundingRectChanged;
+        item->d_ptr->notifyBoundingRectChanged = 0;
         if (recursive) {
             for (int i = 0; i < item->d_ptr->children.size(); ++i)
                 resetDirtyItem(item->d_ptr->children.at(i), recursive);
         }
+        if (notifyEffect && item->d_ptr->graphicsEffect)
+            item->d_ptr->graphicsEffect->sourceBoundingRectChanged();
     }
 
     inline void ensureSortedTopLevelItems()