fix: bot stuck when forcefully disconnected without using command

src/handlers/voice_state_handler.rs

@@ -31,7 +31,7 @@ async fn get_channel_info(ctx: &Context, voice_state: &VoiceState) -> Option<Gui
     Some(voice_channel)
 }
 
-pub async fn handle_voice_update(ctx: Context, voice_state_old: VoiceState, voice_state: VoiceState) -> Option<()> {
+pub async fn handle_autodisconnect(ctx: Context, voice_state_old: VoiceState, voice_state: VoiceState) -> Option<()> {
         // Logic is as follows:
         // User connected -> voice_state_old is None (we handle this before this function)
         // Bot was moved to different vc -> we check if the new voice_state has the bot's user id
@@ -87,3 +87,24 @@ pub async fn handle_voice_update(ctx: Context, voice_state_old: VoiceState, voic
     
         None
 }
+
+pub async fn handle_voice_update(ctx: Context, voice_state_old: VoiceState, voice_state: VoiceState) -> Option<()> {
+    // if the user was disconnected remove Songbird manager so it won't get stuck
+    // Actually this is not really a bug since we can handle disconnect and therefore saving the song queue for example
+    if voice_state.channel_id.is_none() && voice_state.user_id == ctx.cache.current_user().id {
+        let manager = songbird::get(&ctx)
+            .await
+            .expect("Songbird Voice client placed in at initialisation.")
+            .clone();
+    
+        let guild_id = voice_state_old.guild_id?;
+        // bot is not connected to any channel via songbird, don't need to do anything
+        if manager.get(guild_id).is_some() {
+            let _ = manager.remove(guild_id).await;
+            return None;
+        }
+    }
+
+    handle_autodisconnect(ctx, voice_state_old, voice_state).await?;
+    None
+}