ASR.NotifyResult directive를 수신하면 그 이후의 다른 dialogRequestId를 수신하기 전까지 f…

…ocus 유지하도록 변경 (#1157)

### Description
- ASR.NotifyResult와 다음 directive 사이에 BackgroundFocusHolder가 focus를 가지고
있도록 변경

NuguClientKit/Sources/Business/BackgroundFocusHolder.swift

@@ -34,15 +34,21 @@ class BackgroundFocusHolder {
         "MediaPlayer.PlaySuspended"
     ]
 
+    private let pendingTargets = [
+        "ASR.NotifyResult"
+    ]
+
     private var handlingEvents = Set<String>()
     private var handlingSoundDirectives = Set<String>()
+    private var handlingPendingDirectives = Set<String>()
     private var dialogState: DialogState = .idle
 
     // Observers
     private let notificationCenter = NotificationCenter.default
     private var eventWillSendObserver: Any?
     private var eventDidSendObserver: Any?
     private var dialogStateObserver: Any?
+    private var directiveReceiveObserver: Any?
     private var directivePrefetchObserver: Any?
     private var directiveCompleteObserver: Any?
 
@@ -82,6 +88,10 @@ class BackgroundFocusHolder {
         if let directiveCompleteObserver = directiveCompleteObserver {
             notificationCenter.removeObserver(directiveCompleteObserver)
         }
+
+        if let directiveReceiveObserver = directiveReceiveObserver {
+            notificationCenter.removeObserver(directiveReceiveObserver)
+        }
     }
 }
 
@@ -107,6 +117,7 @@ private extension BackgroundFocusHolder {
     func tryReleaseFocus() {
         guard handlingEvents.isEmpty,
               handlingSoundDirectives.isEmpty,
+              handlingPendingDirectives.isEmpty,
               dialogState == .idle else { return }
 
         focusManager.releaseFocus(channelDelegate: self)
@@ -137,6 +148,22 @@ private extension BackgroundFocusHolder {
                 }
             }
         }
+
+        directiveReceiveObserver = object.observe(NuguCoreNotification.StreamDataRoute.ReceivedDirective.self, queue: nil) { [weak self] notification in
+            self?.queue.async { [weak self] in
+                guard let self else { return }
+                let dialogRequestId = notification.directive.header.dialogRequestId
+                if pendingTargets.contains(notification.directive.header.type) {
+                    handlingPendingDirectives.insert(dialogRequestId)
+                    requestFocus()
+                } else if handlingPendingDirectives.contains(dialogRequestId) {
+                    // PendingTarget과 동일한 dialogRequestId를 수신할 경우 focus를 유지
+                } else {
+                    handlingPendingDirectives.removeAll()
+                    tryReleaseFocus()
+                }
+            }
+        }
     }
 
     func addDialogStateObserver(_ object: DialogStateAggregator) {