Make it compile against qt5.15 without deprecated method

lyricswidget.cpp

@@ -113,7 +113,11 @@ void LyricsWidget::showEvent(QShowEvent *)
 void LyricsWidget::receiveListReply(QNetworkReply* reply)
 {
     disconnect(m_networkAccessManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(receiveListReply(QNetworkReply*)));
+#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
     if (reply->error() != QNetworkReply::NoError) {
+#else
+    if (reply->networkError() != QNetworkReply::NoError) {
+#endif
         qCWarning(JUK_LOG) << "Error while fetching lyrics: " << reply->errorString();
         setHtml(i18n("<span style='color:red'>Error while retrieving lyrics!</span>"));
         return;
@@ -142,7 +146,11 @@ void LyricsWidget::receiveListReply(QNetworkReply* reply)
 void LyricsWidget::receiveLyricsReply(QNetworkReply* reply)
 {
     disconnect(m_networkAccessManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(receiveLyricsReply(QNetworkReply*)));
+#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
     if (reply->error() != QNetworkReply::NoError) {
+#else
+    if (reply->networkError() != QNetworkReply::NoError) {
+#endif
         qCWarning(JUK_LOG) << "Error while fetching lyrics: " << reply->errorString();
         setHtml(i18n("<span style='color:red'>Error while retrieving lyrics!</span>"));
         return;

nowplaying.cpp

@@ -122,7 +122,9 @@ CoverItem::CoverItem(NowPlaying *parent) :
     NowPlayingItem(parent)
 {
     setObjectName(QLatin1String("CoverItem"));
-    setFixedHeight(parent->height() - parent->layout()->margin() * 2);
+    const QMargins margins = parent->layout()->contentsMargins();
+
+    setFixedHeight(parent->height() - (margins.top() + margins.bottom()));
     setContentsMargins(1, 1, 1, 1);
     setAcceptDrops(true);
 }
@@ -249,7 +251,8 @@ TrackItem::TrackItem(NowPlaying *parent) :
     NowPlayingItem(parent)
 {
     setObjectName(QLatin1String("TrackItem"));
-    setFixedHeight(parent->height() - parent->layout()->margin() * 2);
+    const QMargins margins = parent->layout()->contentsMargins();
+    setFixedHeight(parent->height() - (margins.top() + margins.bottom()));
     setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 
     QVBoxLayout *layout = new QVBoxLayout(this);

playlist.cpp

@@ -280,7 +280,7 @@ void Playlist::save()
     QStringList fileList = files();
 
     foreach(const QString &file, fileList)
-        stream << file << endl;
+        stream << file << '\n';
 
     file.close();
 }
@@ -551,7 +551,7 @@ void Playlist::slotAddCover(bool retrieveLocal)
         this, i18n("Select Cover Image File"),
         QUrl::fromLocalFile(QDir::home().path()),
         i18n("Images (*.png *.jpg)"), nullptr,
-        0, QStringList() << QStringLiteral("file")
+        {}, QStringList() << QStringLiteral("file")
         );
     if(file.isEmpty())
         return;

scrobbler.cpp

@@ -187,7 +187,11 @@ void Scrobbler::handleAuthenticationReply()
     QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
 
     qCDebug(JUK_LOG) << "got authentication reply";
-    if(reply->error() != QNetworkReply::NoError) {
+#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
+    if (reply->error() != QNetworkReply::NoError) {
+#else
+    if (reply->networkError() != QNetworkReply::NoError) {
+#endif
         emit invalidAuth();
         qCWarning(JUK_LOG) << "Error while getting authentication reply" << reply->errorString();
         return;