Save cache if toggle grouping

devices/device.cpp

@@ -149,6 +149,12 @@ Song Device::fixPath(const Song &orig, bool fullPath) const
 
 #include <unistd.h>
 
+void Device::toggleGrouping()
+{
+    MusicLibraryItemRoot::toggleGrouping();
+    saveCache();
+}
+
 const QLatin1String Device::constNoCover("-");
 const QLatin1String Device::constEmbedCover("+");
 

devices/device.h

@@ -160,6 +160,7 @@ public:
     virtual void removeCache() { }
 
     #ifndef Q_OS_WIN
+    void toggleGrouping();
     virtual void saveCache();
     const QString & id() const { return deviceId; }
     void applyUpdate();

models/musiclibraryitemroot.h

@@ -96,7 +96,7 @@ public:
     void setUseArtistImages(bool a) { artistImages=a; }
     bool useLargeImages() const { return largeImages; }
     void setLargeImages(bool a) { largeImages=a; }
-    void toggleGrouping();
+    virtual void toggleGrouping();
     void applyGrouping();
     void clearItems();
     void setModel(MusicModel *m) { m_model=m; }

models/musiclibrarymodel.cpp

@@ -552,6 +552,7 @@ void MusicLibraryModel::toggleGrouping()
 {
     beginResetModel();
     rootItem->toggleGrouping();
+    rootItem->toXML(cacheFileName(), databaseTime);
     endResetModel();
     if (mpdModel) {
         AlbumsModel::self()->update(rootItem);