don't reload thumbnails everytime documentscenechanged is called + reload after duplicate in Board Mode

src/board/UBBoardController.cpp

@@ -589,8 +589,8 @@ void UBBoardController::duplicateScene(int nIndex)
     if (UBApplication::documentController->selectedDocument() == selectedDocument())
     {
         UBApplication::documentController->insertThumbPage(nIndex);
+        UBApplication::documentController->reloadThumbnails();
     }
-    //emit documentThumbnailsUpdated(this);
     emit addThumbnailRequired(this, nIndex + 1);
     selectedDocument()->setMetaData(UBSettings::documentUpdatedAt, UBStringUtils::toUtcIsoDateTime(QDateTime::currentDateTime()));
 

src/document/UBDocumentController.cpp

@@ -2382,7 +2382,10 @@ void UBDocumentController::duplicateSelectedItem()
         if (selectedSceneIndexes.count() > 0)
         {
             duplicatePages(selectedSceneIndexes);
-            emit documentThumbnailsUpdated(this);
+            if (selectedDocument() == selectedDocumentProxy())
+            {
+                reloadThumbnails();
+            }
             selectedDocument()->setMetaData(UBSettings::documentUpdatedAt, UBStringUtils::toUtcIsoDateTime(QDateTime::currentDateTime()));
             UBMetadataDcSubsetAdaptor::persist(selectedDocument());
             int selectedThumbnail = selectedSceneIndexes.last() + selectedSceneIndexes.size();
@@ -3132,11 +3135,6 @@ void UBDocumentController::documentSceneChanged(UBDocumentProxy* proxy, int pSce
 {
     Q_UNUSED(pSceneIndex);
 
-    if (proxy == selectedDocumentProxy())
-    {
-        reloadThumbnails();
-    }
-
     QModelIndexList sel = mDocumentUI->documentTreeView->selectionModel()->selectedRows(0);
 
     QModelIndex selection;