Fix referencedMessage author

src/Discord.Net.Rest/Entities/Channels/ChannelHelper.cs

@@ -6,7 +6,6 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using Model = Discord.API.Channel;
-using UserModel = Discord.API.User;
 
 namespace Discord.Rest
 {
@@ -130,7 +129,7 @@ namespace Discord.Rest
             var model = await client.ApiClient.GetChannelMessageAsync(channel.Id, id, options).ConfigureAwait(false);
             if (model == null)
                 return null;
-            var author = GetAuthor(client, guild, model.Author.Value, model.WebhookId.ToNullable());
+            var author = MessageHelper.GetAuthor(client, guild, model.Author.Value, model.WebhookId.ToNullable());
             return RestMessage.Create(client, channel, author, model);
         }
         public static IAsyncEnumerable<IReadOnlyCollection<RestMessage>> GetMessagesAsync(IMessageChannel channel, BaseDiscordClient client,
@@ -165,7 +164,7 @@ namespace Discord.Rest
                     var builder = ImmutableArray.CreateBuilder<RestMessage>();
                     foreach (var model in models)
                     {
-                        var author = GetAuthor(client, guild, model.Author.Value, model.WebhookId.ToNullable());
+                        var author = MessageHelper.GetAuthor(client, guild, model.Author.Value, model.WebhookId.ToNullable());
                         builder.Add(RestMessage.Create(client, channel, author, model));
                     }
                     return builder.ToImmutable();
@@ -193,7 +192,7 @@ namespace Discord.Rest
             var builder = ImmutableArray.CreateBuilder<RestMessage>();
             foreach (var model in models)
             {
-                var author = GetAuthor(client, guild, model.Author.Value, model.WebhookId.ToNullable());
+                var author = MessageHelper.GetAuthor(client, guild, model.Author.Value, model.WebhookId.ToNullable());
                 builder.Add(RestMessage.Create(client, channel, author, model));
             }
             return builder.ToImmutable();
@@ -450,16 +449,5 @@ namespace Discord.Rest
             };
             await client.ApiClient.ModifyGuildChannelAsync(channel.Id, apiArgs, options).ConfigureAwait(false);
         }
-
-        //Helpers
-        private static IUser GetAuthor(BaseDiscordClient client, IGuild guild, UserModel model, ulong? webhookId)
-        {
-            IUser author = null;
-            if (guild != null)
-                author = guild.GetUserAsync(model.Id, CacheMode.CacheOnly).Result;
-            if (author == null)
-                author = RestUser.Create(client, guild, model, webhookId);
-            return author;
-        }
     }
 }

src/Discord.Net.Rest/Entities/Messages/MessageHelper.cs

@@ -6,6 +6,7 @@ using System.Linq;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Model = Discord.API.Message;
+using UserModel = Discord.API.User;
 
 namespace Discord.Rest
 {
@@ -299,5 +300,15 @@ namespace Discord.Rest
         {
             await client.ApiClient.CrosspostAsync(channelId, msgId, options).ConfigureAwait(false);
         }
+
+        public static IUser GetAuthor(BaseDiscordClient client, IGuild guild, UserModel model, ulong? webhookId)
+        {
+            IUser author = null;
+            if (guild != null)
+                author = guild.GetUserAsync(model.Id, CacheMode.CacheOnly).Result;
+            if (author == null)
+                author = RestUser.Create(client, guild, model, webhookId);
+            return author;
+        }
     }
 }

src/Discord.Net.Rest/Entities/Messages/RestUserMessage.cs

@@ -121,17 +121,21 @@ namespace Discord.Rest
                 }
             }
 
+            var guildId = (Channel as IGuildChannel)?.GuildId;
+            var guild = guildId != null ? (Discord as IDiscordClient).GetGuildAsync(guildId.Value, CacheMode.CacheOnly).Result : null;
             if (model.Content.IsSpecified)
             {
                 var text = model.Content.Value;
-                var guildId = (Channel as IGuildChannel)?.GuildId;
-                var guild = guildId != null ? (Discord as IDiscordClient).GetGuildAsync(guildId.Value, CacheMode.CacheOnly).Result : null;
                 _tags = MessageHelper.ParseTags(text, null, guild, _userMentions);
                 model.Content = text;
             }
 
             if (model.ReferencedMessage.IsSpecified && model.ReferencedMessage.Value != null)
-                _referencedMessage = RestUserMessage.Create(Discord, Channel, Author, model.ReferencedMessage.Value);
+            {
+                var refMsg = model.ReferencedMessage.Value;
+                IUser refMsgAuthor = MessageHelper.GetAuthor(Discord, guild, refMsg.Author.Value, refMsg.WebhookId.ToNullable());
+                _referencedMessage = RestUserMessage.Create(Discord, Channel, refMsgAuthor, refMsg);
+            }
         }
 
         /// <inheritdoc />