fix(MessageReaction): Prevent event double fire from uncached messages (#6818)

src/client/actions/MessageReactionAdd.js

@@ -15,7 +15,7 @@ const { PartialTypes } = require('../../util/Constants');
 */
 
 class MessageReactionAdd extends Action {
-  handle(data) {
+  handle(data, fromStructure = false) {
     if (!data.emoji) return false;
 
     const user = this.getUserFromMember(data);
@@ -30,9 +30,8 @@ class MessageReactionAdd extends Action {
     if (!message) return false;
 
     // Verify reaction
-    if (message.partial && !this.client.options.partials.includes(PartialTypes.REACTION)) return false;
-    const existing = message.reactions.cache.get(data.emoji.id ?? data.emoji.name);
-    if (existing?.users.cache.has(user.id)) return { message, reaction: existing, user };
+    const includePartial = this.client.options.partials.includes(PartialTypes.REACTION);
+    if (message.partial && !includePartial) return false;
     const reaction = message.reactions._add({
       emoji: data.emoji,
       count: message.partial ? null : 0,
@@ -40,6 +39,7 @@ class MessageReactionAdd extends Action {
     });
     if (!reaction) return false;
     reaction._add(user);
+    if (fromStructure) return { message, reaction, user };
     /**
      * Emitted whenever a reaction is added to a cached message.
      * @event Client#messageReactionAdd

src/structures/Message.js

@@ -717,14 +717,17 @@ class Message extends Base {
    */
   async react(emoji) {
     if (!this.channel) throw new Error('CHANNEL_NOT_CACHED');
-    emoji = this.client.emojis.resolveIdentifier(emoji);
     await this.channel.messages.react(this.id, emoji);
-    return this.client.actions.MessageReactionAdd.handle({
-      user: this.client.user,
-      channel: this.channel,
-      message: this,
-      emoji: Util.parseEmoji(emoji),
-    }).reaction;
+
+    return this.client.actions.MessageReactionAdd.handle(
+      {
+        user: this.client.user,
+        channel: this.channel,
+        message: this,
+        emoji: Util.resolvePartialEmoji(emoji),
+      },
+      true,
+    ).reaction;
   }
 
   /**