From 330ff449705a5195713a10749a40991e9ad2a8d5 Mon Sep 17 00:00:00 2001
From: jamesbt365 <jamesbt365@gmail.com>
Date: Sat, 7 Oct 2023 19:33:10 +0100
Subject: [PATCH] Provide old thread data in `thread_update` (#2553)

---
 src/client/dispatch.rs      | 5 +++--
 src/client/event_handler.rs | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/client/dispatch.rs b/src/client/dispatch.rs
index 6ca92bcb2a0..a503043fbe2 100644
--- a/src/client/dispatch.rs
+++ b/src/client/dispatch.rs
@@ -468,11 +468,12 @@ fn update_cache_with_event(ctx: Context, event: Event) -> Option<(FullEvent, Opt
             }
         },
         Event::ThreadUpdate(mut event) => {
-            update_cache(&ctx, &mut event);
+            let old = if_cache!(update_cache(&ctx, &mut event));
 
             FullEvent::ThreadUpdate {
                 ctx,
-                thread: event.thread,
+                old,
+                new: event.thread,
             }
         },
         Event::ThreadDelete(mut event) => {
diff --git a/src/client/event_handler.rs b/src/client/event_handler.rs
index 9f475ba0059..49357acbea2 100644
--- a/src/client/event_handler.rs
+++ b/src/client/event_handler.rs
@@ -384,8 +384,8 @@ event_handler! {
 
     /// Dispatched when a thread is updated.
     ///
-    /// Provides the updated thread.
-    async fn thread_update(&self, ThreadUpdate { ctx: Context, thread: GuildChannel });
+    /// Provides the updated thread and the old thread data, provided the thread was cached prior to dispatch.
+    async fn thread_update(&self, ThreadUpdate { ctx: Context, old: Option<GuildChannel>, new: GuildChannel });
 
     /// Dispatched when a thread is deleted.
     ///