add support for modifing default reaction & some renaming

src/Discord.Net.Core/Entities/Channels/ForumChannelProperties.cs

@@ -47,4 +47,9 @@ public class ForumChannelProperties : TextChannelProperties
     /// Gets or sets a collection of tags inside of this forum channel.
     /// </summary>
     public Optional<IEnumerable<ForumTagProperties>> Tags { get; set; }
+
+    /// <summary>
+    /// Gets or sets a new default reaction emoji in this forum channel.
+    /// </summary>
+    public Optional<IEmote> DefaultReactionEmoji { get; set; }
 }

src/Discord.Net.Rest/API/Common/ForumReactionEmoji.cs

@@ -5,7 +5,7 @@ namespace Discord.API;
 public class ForumReactionEmoji
 {
     [JsonProperty("emoji_id")]
-    public Optional<ulong> EmojiId { get; set; }
+    public Optional<ulong?> EmojiId { get; set; }
 
     [JsonProperty("emoji_name")]
     public Optional<string> EmojiName { get; set; }

src/Discord.Net.Rest/API/Rest/ModifyForumChannelParams.cs

@@ -7,11 +7,14 @@ namespace Discord.API.Rest;
 internal class ModifyForumChannelParams : ModifyTextChannelParams
 {
     [JsonProperty("available_tags")]
-    public Optional<ForumTagParams[]> Tags { get; set; }
+    public Optional<ModifyForumTagParams[]> Tags { get; set; }
 
     [JsonProperty("default_thread_rate_limit_per_user")]
     public Optional<int> DefaultSlowModeInterval { get; set; }
 
     [JsonProperty("rate_limit_per_user")]
     public Optional<int> ThreadCreationInterval { get; set; }
+
+    [JsonProperty("default_reaction_emoji")]
+    public Optional<ModifyForumReactionEmojiParams> DefaultReactionEmoji { get; set; }
 }

src/Discord.Net.Rest/API/Rest/ModifyForumReactionEmojiParams.cs

@@ -0,0 +1,15 @@
+using Newtonsoft.Json;
+
+namespace Discord.API;
+
+[JsonObject(MemberSerialization = MemberSerialization.OptIn)]
+public class ModifyForumReactionEmojiParams
+{
+    [JsonProperty("emoji_id")]
+    public Optional<ulong?> EmojiId { get; set; }
+
+    [JsonProperty("emoji_name")]
+    public Optional<string> EmojiName { get; set; }
+}
+
+

src/Discord.Net.Rest/API/Rest/ForumTagParams.cs → src/Discord.Net.Rest/API/Rest/ModifyForumTagParams.cs

@@ -3,7 +3,7 @@ using Newtonsoft.Json;
 namespace Discord.API
 {
     [JsonObject(MemberSerialization = MemberSerialization.OptIn)]
-    internal class ForumTagParams
+    internal class ModifyForumTagParams
     {
         [JsonProperty("id")]
         public Optional<ulong> Id { get; set; }

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

@@ -1,3 +1,4 @@
+using Discord.API;
 using System;
 using System.Linq;
 using System.Threading.Tasks;
@@ -30,7 +31,7 @@ internal static class ForumHelper
             DefaultSlowModeInterval = args.DefaultSlowModeInterval,
             ThreadCreationInterval = args.ThreadCreationInterval,
             Tags = args.Tags.IsSpecified
-                ? args.Tags.Value.Select(tag => new API.ForumTagParams
+                ? args.Tags.Value.Select(tag => new API.ModifyForumTagParams
                 {
                     Name = tag.Name,
                     EmojiId = tag.Emoji is Emote emote
@@ -40,9 +41,18 @@ internal static class ForumHelper
                         ? emoji.Name
                         : Optional<string>.Unspecified
                 }).ToArray()
-                : Optional.Create<API.ForumTagParams[]>(),
+                : Optional.Create<API.ModifyForumTagParams[]>(),
             Flags = args.Flags.GetValueOrDefault(),
             Topic = args.Topic,
+            DefaultReactionEmoji = args.DefaultReactionEmoji.IsSpecified
+                ? new API.ModifyForumReactionEmojiParams
+                {
+                    EmojiId = args.DefaultReactionEmoji.Value is Emote emote ?
+                        emote.Id : Optional<ulong?>.Unspecified,
+                    EmojiName = args.DefaultReactionEmoji.Value is Emoji emoji ?
+                        emoji.Name : Optional<string>.Unspecified
+                }
+                : Optional<ModifyForumReactionEmojiParams>.Unspecified
         };
         return await client.ApiClient.ModifyGuildChannelAsync(channel.Id, apiArgs, options).ConfigureAwait(false);
     }

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

@@ -74,7 +74,7 @@ namespace Discord.Rest
             if (model.DefaultReactionEmoji.IsSpecified)
             {
                 if (model.DefaultReactionEmoji.Value.EmojiId.IsSpecified && model.DefaultReactionEmoji.Value.EmojiId.Value != 0)
-                    DefaultReactionEmoji = new Emote(model.DefaultReactionEmoji.Value.EmojiId.Value, null, false);
+                    DefaultReactionEmoji = new Emote(model.DefaultReactionEmoji.Value.EmojiId.Value.GetValueOrDefault(), null, false);
                 else if (model.DefaultReactionEmoji.Value.EmojiName.IsSpecified)
                     DefaultReactionEmoji = new Emoji(model.DefaultReactionEmoji.Value.EmojiName.Value);
                 else

src/Discord.Net.WebSocket/Entities/Channels/SocketForumChannel.cs

@@ -80,7 +80,7 @@ namespace Discord.WebSocket
             if (model.DefaultReactionEmoji.IsSpecified)
             {
                 if (model.DefaultReactionEmoji.Value.EmojiId.IsSpecified && model.DefaultReactionEmoji.Value.EmojiId.Value != 0)
-                    DefaultReactionEmoji = new Emote(model.DefaultReactionEmoji.Value.EmojiId.Value, null, false);
+                    DefaultReactionEmoji = new Emote(model.DefaultReactionEmoji.Value.EmojiId.Value.GetValueOrDefault(), null, false);
                 else if (model.DefaultReactionEmoji.Value.EmojiName.IsSpecified)
                     DefaultReactionEmoji = new Emoji(model.DefaultReactionEmoji.Value.EmojiName.Value);
                 else