Mark spotify streams as not seekable

src/internet/lastfmservice.cpp

@@ -941,7 +941,8 @@ void LastFMService::TuneFinished() {
 
 PlaylistItem::Options LastFMService::playlistitem_options() const {
   return PlaylistItem::LastFMControls |
-         PlaylistItem::PauseDisabled;
+         PlaylistItem::PauseDisabled |
+         PlaylistItem::SeekDisabled;
 }
 
 PlaylistItemPtr LastFMService::PlaylistItemForUrl(const QUrl& url) {

src/internet/spotifyservice.cpp

@@ -475,7 +475,7 @@ void SpotifyService::SongFromProtobuf(const spotify_pb::Track& track, Song* song
 }
 
 PlaylistItem::Options SpotifyService::playlistitem_options() const {
-  return PlaylistItem::PauseDisabled;
+  return PlaylistItem::PauseDisabled | PlaylistItem::SeekDisabled;
 }
 
 void SpotifyService::EnsureMenuCreated() {

src/playlist/playlistitem.h

@@ -47,6 +47,9 @@ class PlaylistItem : public boost::enable_shared_from_this<PlaylistItem> {
 
     // Enables the last.fm "ban" action.
     LastFMControls = 0x02,
+
+    // Disables the seek slider.
+    SeekDisabled = 0x04,
   };
   Q_DECLARE_FLAGS(Options, Option);
 

src/ui/mainwindow.cpp

@@ -875,6 +875,9 @@ void MainWindow::MediaPlaying() {
   bool enable_play_pause = !(player_->GetCurrentItem()->options() & PlaylistItem::PauseDisabled);
   ui_->action_play_pause->setEnabled(enable_play_pause);
 
+  bool can_seek = !(player_->GetCurrentItem()->options() & PlaylistItem::SeekDisabled);
+  ui_->track_slider->SetCanSeek(can_seek);
+
 #ifdef HAVE_LIBLASTFM
   bool is_lastfm = (player_->GetCurrentItem()->options() & PlaylistItem::LastFMControls);
   LastFMService* lastfm = InternetModel::Service<LastFMService>();
@@ -887,10 +890,7 @@ void MainWindow::MediaPlaying() {
   tray_icon_->LastFMButtonLoveStateChanged(enable_love);
 
   tray_icon_->SetPlaying(enable_play_pause, enable_ban, enable_love);
-
-  ui_->track_slider->SetCanSeek(!is_lastfm);
 #else
-  ui_->track_slider->SetCanSeek(true);
   tray_icon_->SetPlaying(enable_play_pause);
 #endif