Workaround ordering returned by GetPostThread API call

mm-go-irckit/service.go

@@ -342,12 +342,27 @@ func scrollback(u *User, toUser *User, args []string, service string) {
 
 	postlist, _ := list.(*model.PostList)
 
-	for i := len(postlist.Order) - 1; i >= 0; i-- {
-		if limit != 0 && len(postlist.Order) > limit && i < len(postlist.Order)-limit {
+	// Workaround https://github.com/mattermost/mattermost-server/issues/23081
+	plOrder := postlist.Order
+	if searchPostID != "" {
+		plOrder = append(plOrder, searchPostID)
+	}
+	skipRoot := false
+
+	for i := len(plOrder) - 1; i >= 0; i-- {
+		if limit != 0 && len(plOrder) > limit && i < len(plOrder)-limit {
 			continue
 		}
 
-		p := postlist.Posts[postlist.Order[i]]
+		p := postlist.Posts[plOrder[i]]
+
+		// Workaround https://github.com/mattermost/mattermost-server/issues/23081
+		if searchPostID != "" && p.Id == searchPostID {
+			if skipRoot {
+				continue
+			}
+			skipRoot = true
+		}
 
 		props := p.GetProps()
 		botname, override := props["override_username"].(string)