COSMETIC: Replaced message box by on-screen notification for download errors

Changelog

@@ -1,6 +1,7 @@
 * Unreleased - Christophe Dumez <chris@qbittorrent.org> - v2.5.0
     - FEATURE: Added feature to shutdown qbittorrent on torrents completion
     - FEATURE: Added a transfer list column to display the current tracker
+    - COSMETIC: Replaced message box by on-screen notification for download errors
 
 * Tue Aug 24 2010 - Christophe Dumez <chris@qbittorrent.org> - v2.4.0
     - FEATURE: Added actions to "Move to top/bottom" of priority queue

src/GUI.cpp

@@ -542,7 +542,7 @@ void GUI::askRecursiveTorrentDownloadConfirmation(QTorrentHandle &h) {
 
 void GUI::handleDownloadFromUrlFailure(QString url, QString reason) const{
   // Display a message box
-  QMessageBox::critical(0, tr("Url download error"), tr("Couldn't download file at url: %1, reason: %2.").arg(url).arg(reason));
+  showNotificationBaloon(tr("Url download error"), tr("Couldn't download file at url: %1, reason: %2.").arg(url).arg(reason));
 }
 
 void GUI::on_actionSet_global_upload_limit_triggered() {