Show all track artists if any differs from album artist

Mac/Components/Browser/Album Detail/AlbumDetailSongTitleView.swift

@@ -13,14 +13,17 @@ class AlbumDetailSongTitleView: NSTableCellView {
   @IBOutlet var songArtist: NSTextField!
   var collapseArtist: NSLayoutConstraint!
   
-  func setSong(_ song: Song) {
+  func setShowArtist(_ show: Bool) {
     if collapseArtist == nil {
        collapseArtist = songArtist?.heightAnchor.constraint(equalToConstant: 0.0)
     }
 
+    collapseArtist.isActive = !show
+  }
+
+  func setSong(_ song: Song) {
     songTitle?.stringValue = song.title
     songArtist?.stringValue = song.artist
-    collapseArtist.isActive = song.artist == song.albumArtist
   }
 }
 

Mac/Components/Browser/Album Detail/AlbumDetailView+NSTableViewDelegate.swift

@@ -82,7 +82,8 @@ extension AlbumDetailView: NSTableViewDelegate {
       withIdentifier: .songTitle,
       owner: self
       ) as! AlbumDetailSongTitleView
-    
+
+    cellView.setShowArtist(dataSource.showSongArtist)
     cellView.setSong(song)
 
     return cellView

Mac/Components/Browser/Album Detail/AlbumTracksDataSource.swift

@@ -25,15 +25,24 @@ class AlbumTracksDataSource: NSObject, NSTableViewDataSource {
   }
 
   var albumSongs: [AlbumSongItem] = []
+  var showSongArtist: Bool = false
 
   func setAlbumSongs(_ songs: [Song]) {
     var disc: String? = ""
+    var albumArtist: String?
 
+    showSongArtist = false
     songs.forEach { song in
       if song.disc != disc && song.disc != "0" {
         disc = song.disc
         albumSongs.append(AlbumSongItem(disc: song.disc))
       }
+      if albumArtist == nil {
+        albumArtist = song.albumArtist
+      }
+      if song.artist != albumArtist {
+        showSongArtist = true
+      }
 
       albumSongs.append(AlbumSongItem(song: song))
     }