Backport pull request #13720 from jellyfin/release-10.10.z

Fix regression where "Search for missing metadata" not handling cast having multiple roles

Original-merge: 91ca81eca7d2c984a096a396cbd83d0111f41c9d

Merged-by: Bond-009 <bond.009@outlook.com>

Backported-by: Bond_009 <bond.009@outlook.com>

MediaBrowser.Providers/Manager/MetadataService.cs

@@ -1146,13 +1146,24 @@ namespace MediaBrowser.Providers.Manager
 
         private static void MergePeople(IReadOnlyList<PersonInfo> source, IReadOnlyList<PersonInfo> target)
         {
-            foreach (var person in target)
+            var sourceByName = source.ToLookup(p => p.Name.RemoveDiacritics(), StringComparer.OrdinalIgnoreCase);
+            var targetByName = target.ToLookup(p => p.Name.RemoveDiacritics(), StringComparer.OrdinalIgnoreCase);
+
+            foreach (var name in targetByName.Select(g => g.Key))
             {
-                var normalizedName = person.Name.RemoveDiacritics();
-                var personInSource = source.FirstOrDefault(i => string.Equals(i.Name.RemoveDiacritics(), normalizedName, StringComparison.OrdinalIgnoreCase));
+                var targetPeople = targetByName[name].ToArray();
+                var sourcePeople = sourceByName[name].ToArray();
 
-                if (personInSource is not null)
+                if (sourcePeople.Length == 0)
                 {
+                    continue;
+                }
+
+                for (int i = 0; i < targetPeople.Length; i++)
+                {
+                    var person = targetPeople[i];
+                    var personInSource = i < sourcePeople.Length ? sourcePeople[i] : sourcePeople[0];
+
                     foreach (var providerId in personInSource.ProviderIds)
                     {
                         person.ProviderIds.TryAdd(providerId.Key, providerId.Value);