Fixed erasing a line made with compass.

src/adaptors/UBSvgSubsetAdaptor.cpp

@@ -591,6 +591,7 @@ UBGraphicsScene* UBSvgSubsetAdaptor::UBSvgSubsetReader::loadScene()
                         if(strokesGroup){
                             polygonItem->setTransform(strokesGroup->transform());
                             strokesGroup->addToGroup(polygonItem);
+                            polygonItem->setStrokesGroup(strokesGroup);
                         }
                     }else{
                         mScene->addItem(polygonItem);

src/domain/UBGraphicsScene.cpp

@@ -541,12 +541,14 @@ bool UBGraphicsScene::inputDeviceRelease()
                 mAddedItems.remove(mArcPolygonItem);
                 removeItem(mArcPolygonItem);
                 UBCoreGraphicsScene::removeItemFromDeletion(mArcPolygonItem);
+                mArcPolygonItem->setStrokesGroup(pStrokes);
                 pStrokes->addToGroup(mArcPolygonItem);
 
                 // Add the center cross
                 foreach(QGraphicsItem* item, mAddedItems){
                     removeItem(item);
                     UBCoreGraphicsScene::removeItemFromDeletion(item);
+                    mArcPolygonItem->setStrokesGroup(pStrokes);
                     pStrokes->addToGroup(item);
                 }