Add "reply in thread" timeline item action menu entry.

ElementX/Sources/Screens/Timeline/View/ItemMenu/TimelineItemMenu.swift

@@ -344,6 +344,7 @@ struct TimelineItemMenu_Previews: PreviewProvider, TestablePreview {
                                                       pinnedEventIDs: [],
                                                       isDM: true,
                                                       isViewSourceEnabled: true,
+                                                      areThreadsEnabled: true,
                                                       timelineKind: .live,
                                                       emojiProvider: EmojiProvider(appSettings: ServiceLocator.shared.settings))
         guard let actions = provider.makeActions() else { return nil }

ElementX/Sources/Screens/Timeline/View/ItemMenu/TimelineItemMenuAction.swift

@@ -65,6 +65,7 @@ enum TimelineItemMenuAction: Identifiable, Hashable {
     case copyPermalink
     case redact
     case reply(isThread: Bool)
+    case replyInThread
     case forward(itemID: TimelineItemIdentifier)
     case viewSource
     case report
@@ -159,6 +160,8 @@ enum TimelineItemMenuAction: Identifiable, Hashable {
             Label(L10n.actionCopyLinkToMessage, icon: \.link)
         case .reply(let isThread):
             Label(isThread ? L10n.actionReplyInThread : L10n.actionReply, icon: \.reply)
+        case .replyInThread:
+            Label(L10n.actionReplyInThread, icon: \.threads)
         case .forward:
             Label(L10n.actionForward, icon: \.forward)
         case .redact:

ElementX/Sources/Screens/Timeline/View/ItemMenu/TimelineItemMenuActionProvider.swift

@@ -16,6 +16,7 @@ struct TimelineItemMenuActionProvider {
     let pinnedEventIDs: Set<String>
     let isDM: Bool
     let isViewSourceEnabled: Bool
+    let areThreadsEnabled: Bool
     let timelineKind: TimelineKind
     let emojiProvider: EmojiProviderProtocol
     
@@ -52,6 +53,10 @@ struct TimelineItemMenuActionProvider {
             } else {
                 actions.append(.reply(isThread: false))
             }
+            
+            if areThreadsEnabled, !timelineKind.isThread {
+                actions.append(.replyInThread)
+            }
         }
         
         if item.isForwardable {