Fixed deletion removed groups.

Code was cleaned.
Corrections in removing strokes.

src/board/UBBoardController.cpp

@@ -1495,7 +1495,7 @@ void UBBoardController::ClearUndoStack()
         while (itRemoved.hasNext())
         {
             QGraphicsItem* item = itRemoved.next();
-            if( !uniqueItems.contains(item) && (item->parentItem() && UBGraphicsGroupContainerItem::Type != item->parentItem()->type()))
+            if( !uniqueItems.contains(item) && !(item->parentItem() && UBGraphicsGroupContainerItem::Type == item->parentItem()->type()))
                 uniqueItems.insert(item);
         }
     }

src/domain/UBGraphicsGroupContainerItem.cpp

@@ -219,10 +219,6 @@ void UBGraphicsGroupContainerItem::destroy() {
     UBCoreGraphicsScene *groupScene = corescene();
 
 
-    if (groupScene) {
-    //    groupScene->addItemToDeletion(this);
-    }
-
     foreach (QGraphicsItem *item, childItems()) {
         pRemoveFromGroup(item);
         item->setFlag(QGraphicsItem::ItemIsSelectable, true);

src/domain/UBGraphicsPolygonItem.cpp

@@ -67,8 +67,8 @@ void UBGraphicsPolygonItem::clearStroke()
 	if (mStroke!=NULL)
 	{
         mStroke->remove(this);
-        //if (mStroke->polygons().empty())
+        if (mStroke->polygons().empty())
-           // delete mStroke;
+            delete mStroke;
         mStroke = NULL;
 	}
 }

src/domain/UBGraphicsScene.cpp

@@ -305,7 +305,10 @@ UBGraphicsScene::~UBGraphicsScene()
 {
     if (mCurrentStroke)
         if (mCurrentStroke->polygons().empty())
+        {
             delete mCurrentStroke;
+            mCurrentStroke = NULL;
+        }
 
     if (mZLayerController)
         delete mZLayerController;
@@ -433,6 +436,11 @@ bool UBGraphicsScene::inputDevicePress(const QPointF& scenePos, const qreal& pre
         }
     }
 
+    if (mCurrentStroke && mCurrentStroke->polygons().empty()){
+        delete mCurrentStroke;    
+        mCurrentStroke = NULL;
+    }
+
     return accepted;
 }
 
@@ -474,6 +482,10 @@ bool UBGraphicsScene::inputDeviceMove(const QPointF& scenePos, const qreal& pres
                     UBCoreGraphicsScene::removeItemFromDeletion(mpLastPolygon);
                     mAddedItems.remove(mpLastPolygon);
                     mCurrentStroke->remove(mpLastPolygon);
+                    if (mCurrentStroke->polygons().empty()){
+                        delete mCurrentStroke;
+                        mCurrentStroke = NULL;
+                    }
                     removeItem(mpLastPolygon);
                     mPreviousPolygonItems.removeAll(mpLastPolygon);
                 }
@@ -2285,6 +2297,11 @@ void UBGraphicsScene::setToolCursor(int tool)
     {
         deselectAllItems();
     }
+
+    if (mCurrentStroke && mCurrentStroke->polygons().empty()){
+        delete mCurrentStroke;
+    }
+    mCurrentStroke = NULL;
 }
 
 void UBGraphicsScene::initStroke(){