Segfault when removing widget containing flash content fixed.

src/domain/UBGraphicsItemDelegate.cpp

@@ -387,11 +387,16 @@ void UBGraphicsItemDelegate::remove(bool canUndo)
             scene->removeItem(button);
 
         scene->removeItem(mFrame);
+
+        /* this is performed because when removing delegated from scene while it contains flash content, segfault happens because of QGraphicsScene::removeItem() */ 
+        UBGraphicsWebView *mDelegated_casted = static_cast<UBGraphicsWebView*>(mDelegated);
+        if (mDelegated_casted)
+            mDelegated_casted->setHtml(QString());
         scene->removeItem(mDelegated);
 
         if (canUndo)
         {
-            UBGraphicsItemUndoCommand *uc = new UBGraphicsItemUndoCommand((UBGraphicsScene*) scene, mDelegated, 0);
+            UBGraphicsItemUndoCommand *uc = new UBGraphicsItemUndoCommand(scene, mDelegated, 0);
             UBApplication::undoStack->push(uc);
         }
     }