Eraser under Linux platform

src/domain/UBGraphicsScene.cpp

@@ -844,8 +844,11 @@ void UBGraphicsScene::eraseLineTo(const QPointF &pEndPoint, const qreal &pWidth)
                             // UBGraphicsPolygonItems and added to the scene
                             foreach(const QPolygonF &pol, croppedPathSimplified.toFillPolygons())
                             {
-                                UBGraphicsPolygonItem* croppedPolygonItem = collidingPolygonItem->deepCopy(pol);
+                                UBGraphicsPolygonItem* croppedPolygonItem;
     #pragma omp critical
+                                {
+                                    croppedPolygonItem = collidingPolygonItem->deepCopy(pol);
+    
                                     if(NULL != pGroup){
                                         croppedPolygonItem->setStrokesGroup(pGroup);
                                         //pGroup->addToGroup(croppedPolygonItem);
@@ -853,6 +856,7 @@ void UBGraphicsScene::eraseLineTo(const QPointF &pEndPoint, const qreal &pWidth)
                                     // Add this new polygon to the 'added' list
                                     toBeAddedItems << croppedPolygonItem;
                                 }
+                            }
     #pragma omp critical
                             // Remove the original polygonitem because it has been replaced by many smaller polygons
                             toBeRemovedItems << collidingPolygonItem;