diff --git a/lib/thumbnailview/previewitemdelegate.cpp b/lib/thumbnailview/previewitemdelegate.cpp
index ec72940b..7f2e4290 100644
--- a/lib/thumbnailview/previewitemdelegate.cpp
+++ b/lib/thumbnailview/previewitemdelegate.cpp
@@ -540,6 +540,8 @@ struct PreviewItemDelegatePrivate
 
     void updateToggleSelectionButton()
     {
+        static int i;
+        qDebug() << "update from previewitemdelegate" << i++;
         mToggleSelectionButton->setIcon(QIcon::fromTheme(
                                             mView->selectionModel()->isSelected(mIndexUnderCursor) ? "list-remove" : "list-add"
                                         ));
diff --git a/lib/thumbnailview/thumbnailbarview.cpp b/lib/thumbnailview/thumbnailbarview.cpp
index 260c1bd8..0a72c725 100644
--- a/lib/thumbnailview/thumbnailbarview.cpp
+++ b/lib/thumbnailview/thumbnailbarview.cpp
@@ -140,6 +140,8 @@ struct ThumbnailBarItemDelegatePrivate
 
     void updateToggleSelectionButton()
     {
+        static int i;
+        qDebug() << "update from thumbnailbarview" << i++;
         bool isSelected = mView->selectionModel()->isSelected(mIndexUnderCursor);
         mToggleSelectionButton->setIcon(QIcon::fromTheme(isSelected ? "list-remove" : "list-add"));
     }