Backwards compatability with config option

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -66,6 +66,7 @@ namespace Discord.WebSocket
         internal WebSocketProvider WebSocketProvider { get; private set; }
         internal bool AlwaysDownloadUsers { get; private set; }
         internal int? HandlerTimeout { get; private set; }
+        internal bool UseMessagesBulkDeletedOnly { get; private set; }
 
         internal new DiscordSocketApiClient ApiClient => base.ApiClient as DiscordSocketApiClient;
         /// <inheritdoc />
@@ -128,6 +129,7 @@ namespace Discord.WebSocket
             WebSocketProvider = config.WebSocketProvider;
             AlwaysDownloadUsers = config.AlwaysDownloadUsers;
             HandlerTimeout = config.HandlerTimeout;
+            UseMessagesBulkDeletedOnly = config.UseMessagesBulkDeletedOnly;
             State = new ClientState(0, 0);
             Rest = new DiscordSocketRestClient(config, ApiClient);
             _heartbeatTimes = new ConcurrentQueue<long>();
@@ -1366,7 +1368,11 @@ namespace Discord.WebSocket
                                         {
                                             var msg = SocketChannelHelper.RemoveMessage(channel, this, id);
                                             bool isCached = msg != null;
-                                            cacheableList = cacheableList.Add(new Cacheable<IMessage, ulong>(msg, id, isCached, async () => await channel.GetMessageAsync(id).ConfigureAwait(false)));
+                                            var cacheable = new Cacheable<IMessage, ulong>(msg, id, isCached, async () => await channel.GetMessageAsync(id).ConfigureAwait(false));
+                                            cacheableList = cacheableList.Add(cacheable);
+
+                                            if (!UseMessagesBulkDeletedOnly)
+                                                await TimedInvokeAsync(_messageDeletedEvent, nameof(MessageDeleted), cacheable, channel).ConfigureAwait(false);
                                         }
 
                                         await TimedInvokeAsync(_messagesBulkDeletedEvent, nameof(MessagesBulkDeleted), cacheableList, channel).ConfigureAwait(false);

src/Discord.Net.WebSocket/DiscordSocketConfig.cs

@@ -104,6 +104,11 @@ namespace Discord.WebSocket
         /// </summary>
         public int? HandlerTimeout { get; set; } = 3000;
 
+        /// <summary>
+        ///     Gets or sets whether or not <see cref="Discord.WebSocket.BaseSocketClient.MessageDeleted"/> is fired for each message on bulk delete.
+        /// </summary>
+        public bool UseMessagesBulkDeletedOnly { get; set; } = false;
+
         /// <summary>
         ///     Initializes a default configuration.
         /// </summary>