[Notifications] Only get descriptionUrl() when actually used

Only for a single file, or in the rare fallback case

libnotificationmanager/job_p.cpp

@@ -159,7 +159,6 @@ QString JobPrivate::text() const
         return m_infoMessage;
     }
 
-    const QString currentFileName = descriptionUrl().fileName();
     const QString destUrlString = prettyDestUrl();
 
     if (m_totalFiles == 0) {
@@ -172,6 +171,7 @@ QString JobPrivate::text() const
             return i18ncp("Copying n files", "%1 file", "%1 files", m_processedFiles);
         }
     } else if (m_totalFiles == 1) {
+        const QString currentFileName = descriptionUrl().fileName();
         if (!destUrlString.isEmpty()) {
             if (!currentFileName.isEmpty()) {
                 return i18nc("Copying file to location", "%1 to %2", currentFileName, destUrlString);
@@ -203,7 +203,7 @@ QString JobPrivate::text() const
     }
 
     qCInfo(NOTIFICATIONMANAGER) << "Failed to generate job text for job with following properties:";
-    qCInfo(NOTIFICATIONMANAGER) << "  processedFiles =" << m_processedFiles << ", totalFiles =" << m_totalFiles << ", current file name =" << currentFileName
+    qCInfo(NOTIFICATIONMANAGER) << "  processedFiles =" << m_processedFiles << ", totalFiles =" << m_totalFiles << ", current file name =" << descriptionUrl().fileName()
                                 << ", destination url string =" << destUrlString;
     qCInfo(NOTIFICATIONMANAGER) << "label1 =" << m_descriptionLabel1 << ", value1 =" << m_descriptionValue1 << ", label2 =" << m_descriptionLabel2
                                 << ", value2 =" << m_descriptionValue2;