internet/core: Remove unused ItemDoubleClicked

ItemDoubleClicked became noop in 70429217c.
Usage of PlayBehaviour_DoubleClickAction was removed in b08172138.

src/internet/core/internetmodel.cpp

@@ -292,14 +292,6 @@ QStringList InternetModel::mimeTypes() const {
 }
 
 QMimeData* InternetModel::mimeData(const QModelIndexList& indexes) const {
-  // Special case for when the user double clicked on a special item.
-  if (indexes.count() == 1 && indexes[0].data(Role_PlayBehaviour).toInt() ==
-                                  PlayBehaviour_DoubleClickAction) {
-    InternetModel::ServiceForIndex(indexes[0])
-        ->ItemDoubleClicked(itemFromIndex(indexes[0]));
-    return nullptr;
-  }
-
   if (indexes.count() == 1 &&
       indexes[0].data(Role_Type).toInt() == Type_SmartPlaylist) {
     GeneratorPtr generator = InternetModel::ServiceForIndex(indexes[0])

src/internet/core/internetmodel.h

@@ -113,10 +113,6 @@ class InternetModel : public QStandardItemModel {
     // This is used when dragging a playlist item for instance, to have all the
     // playlit's items info loaded in the mime data.
     PlayBehaviour_MultipleItems,
-
-    // This item might not represent a song - the service's ItemDoubleClicked()
-    // slot will get called instead to do some custom action.
-    PlayBehaviour_DoubleClickAction,
   };
 
   struct ServiceItem {

src/internet/core/internetservice.h

@@ -64,7 +64,6 @@ class InternetService : public QObject {
   virtual bool has_initial_load_settings() const { return false; }
   virtual void InitialLoadSettings() {}
   virtual void ShowContextMenu(const QPoint& global_pos) {}
-  virtual void ItemDoubleClicked(QStandardItem* item) {}
   // Create a generator for smart playlists
   virtual smart_playlists::GeneratorPtr CreateGenerator(QStandardItem* item) {
     return smart_playlists::GeneratorPtr();

src/internet/spotify/spotifyservice.cpp

@@ -850,8 +850,6 @@ void SpotifyService::GetCurrentPlaylistUrlToShare() const {
   InternetService::ShowUrlBox(tr("Spotify playlist's URL"), url);
 }
 
-void SpotifyService::ItemDoubleClicked(QStandardItem* item) {}
-
 void SpotifyService::DropMimeData(const QMimeData* data,
                                   const QModelIndex& index) {
   QModelIndex playlist_root_index = index;

src/internet/spotify/spotifyservice.h

@@ -73,7 +73,6 @@ class SpotifyService : public InternetService {
   QStandardItem* CreateRootItem() override;
   void LazyPopulate(QStandardItem* parent) override;
   void ShowContextMenu(const QPoint& global_pos) override;
-  void ItemDoubleClicked(QStandardItem* item) override;
   void DropMimeData(const QMimeData* data, const QModelIndex& index) override;
   QList<QAction*> playlistitem_actions(const Song& song) override;
   PlaylistItem::Options playlistitem_options() const override;