fixed missing calls to reloadThumbnails in some cases

src/board/UBBoardController.cpp

@@ -1428,12 +1428,15 @@ UBItem *UBBoardController::downloadFinished(bool pSuccess, QUrl sourceUrl, QUrl
                 QStringList fileNames;
                 fileNames << pdfFile.fileName();
                 result = UBDocumentManager::documentManager()->addFilesToDocument(selectedDocument(), fileNames);
-                emit documentThumbnailsUpdated(this);
                 pdfFile.close();
             }
         }
 
-        if (result){
+        if (result)
+        {
+            if (UBApplication::documentController->selectedDocument() == selectedDocument())
+                UBApplication::documentController->reloadThumbnails();
+
             selectedDocument()->setMetaData(UBSettings::documentUpdatedAt, UBStringUtils::toUtcIsoDateTime(QDateTime::currentDateTime()));
         }
     }

src/document/UBDocumentController.cpp

@@ -3049,6 +3049,7 @@ bool UBDocumentController::addFileToDocument(UBDocumentProxy* document)
         {
             document->setMetaData(UBSettings::documentUpdatedAt, UBStringUtils::toUtcIsoDateTime(QDateTime::currentDateTime()));
             UBMetadataDcSubsetAdaptor::persist(document);
+            reloadThumbnails();
         }
         else
         {