refactor: resync with qbqt baseline and restore genre browser

src/mainwindow.hpp

@@ -19,6 +19,8 @@
 #include <QPair>
 #include <QString>
 
+class Mpris;
+
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
@@ -62,7 +64,9 @@ private:
     QueuePanel      *m_queuePanel  = nullptr;
     SidePanel::View *m_sidePanel   = nullptr;
     QDockWidget     *m_libraryDock = nullptr;
-    LastFmScrobbler  *m_scrobbler   = nullptr;
+    LastFmScrobbler *m_scrobbler   = nullptr;
+    Mpris           *m_mpris       = nullptr;
+    bool m_nextTrackPrefetched = false;
 
     void setupMenuBar();
     void tryRestoreSession();