Fixed regression on artist/release artist handling + fixed bug when firing a signal on still connected but deleted listener

src/libs/database/impl/Track.cpp

@@ -509,12 +509,13 @@ Track::getArtists(EnumSet<TrackArtistLinkType> linkTypes) const
 		oss << ")";
 	}
 
-	Wt::Dbo::Query<Artist::pointer> query {session()->query<Artist::pointer>(oss.str())
-		.where("t.id = ?").bind(self()->id())};
+	Wt::Dbo::Query<Artist::pointer> query {session()->query<Artist::pointer>(oss.str())};
 
 	for (TrackArtistLinkType type : linkTypes)
 		query.bind(type);
 
+	query.where("t.id = ?").bind(self()->id());
+
 	Wt::Dbo::collection<Artist::pointer> res = query;
 	return std::vector<Artist::pointer>(std::begin(res), std::end(res));
 }

src/libs/database/include/database/User.hpp

@@ -132,8 +132,9 @@ class User : public Wt::Dbo::Dbo<User>
 		// Do not change enum values!
 		enum class SubsonicArtistListMode
 		{
-			AllArtists	= 0,
+			AllArtists		= 0,
 			ReleaseArtists	= 1,
+			TrackArtists	= 2,
 		};
 
 		static inline const std::size_t 	MinNameLength {3};