Use QString::arg()

src/lyrics/geniuslyricsprovider.cpp

@@ -297,7 +297,7 @@ bool GeniusLyricsProvider::StartSearch(const int id, const LyricsSearchRequest &
   requests_search_.insert(id, search);
 
   QUrlQuery url_query;
-  url_query.addQueryItem("q", QUrl::toPercentEncoding(QString(request.artist + " " + request.title)));
+  url_query.addQueryItem("q", QUrl::toPercentEncoding(QString("%1 %2").arg(request.artist, request.title)));
 
   QUrl url(kUrlSearch);
   url.setQuery(url_query);

src/playlistparsers/asxparser.cpp

@@ -55,7 +55,7 @@ SongList ASXParser::Load(QIODevice *device, const QString &playlist_path, const
     QString url = re_match.captured(2);
     url.replace(QRegularExpression("&(?!amp;|quot;|apos;|lt;|gt;)"), "&");
 
-    QByteArray replacement = QString(re_match.captured(1) + url + "\"").toLocal8Bit();
+    QByteArray replacement = QString("%1%2\"").arg(re_match.captured(1), url).toLocal8Bit();
     data.replace(re_match.captured(0).toLocal8Bit(), replacement);
     index += replacement.length();
   }

src/queue/queue.cpp

@@ -158,7 +158,7 @@ QVariant Queue::data(const QModelIndex &proxy_index, int role) const {
       const QString title = source_index.sibling(source_index.row(), Playlist::Column_Title).data().toString();
 
       if (artist.isEmpty()) return title;
-      return QString(artist + " - " + title);
+      return QString("%1 - %2").arg(artist, title);
     }
 
     default:

src/utilities/envutils.cpp

@@ -54,7 +54,7 @@ QString DesktopEnvironment() {
   QString session = GetEnv("DESKTOP_SESSION");
   qint64 slash = session.lastIndexOf('/');
   if (slash != -1) {
-    QSettings desktop_file(QString(session + ".desktop"), QSettings::IniFormat);
+    QSettings desktop_file(QString("%1.desktop").arg(session), QSettings::IniFormat);
     desktop_file.beginGroup("Desktop Entry");
     QString name = desktop_file.value("DesktopNames").toString();
     desktop_file.endGroup();