fiexed two issues where page count could be corrupted

src/core/UBPersistenceManager.cpp

@@ -782,10 +782,10 @@ void UBPersistenceManager::duplicateDocumentScene(UBDocumentProxy* proxy, int in
     }
     scene->setModified(true);
 
-    persistDocumentScene(proxy,scene, index + 1);
-
     proxy->incPageCount();
 
+    persistDocumentScene(proxy,scene, index + 1);
+
     emit documentSceneCreated(proxy, index + 1);
 }
 
@@ -842,10 +842,10 @@ UBGraphicsScene* UBPersistenceManager::createDocumentSceneAt(UBDocumentProxy* pr
 
     newScene->setBackgroundGridSize(UBSettings::settings()->crossSize);
 
-    persistDocumentScene(proxy, newScene, index);
-
     proxy->incPageCount();
 
+    persistDocumentScene(proxy, newScene, index);
+
     emit documentSceneCreated(proxy, index);
 
     return newScene;