context: fix thread inheriting

context.go

@@ -424,7 +424,7 @@ func (c *nativeContext) Args() []string {
 }
 
 func (c *nativeContext) Send(what interface{}, opts ...interface{}) error {
-	opts = c.inheritOpts(opts)
+	opts = c.inheritOpts(opts...)
 	_, err := c.b.Send(c.Recipient(), what, opts...)
 	return err
 }
@@ -434,6 +434,10 @@ func (c *nativeContext) inheritOpts(opts ...interface{}) []interface{} {
 		ignoreThread bool
 	)
 
+	if opts == nil {
+		opts = make([]interface{}, 0)
+	}
+
 	for _, opt := range opts {
 		switch opt.(type) {
 		case Option:
@@ -447,14 +451,14 @@ func (c *nativeContext) inheritOpts(opts ...interface{}) []interface{} {
 
 	switch {
 	case !ignoreThread && c.Message() != nil && c.Message().ThreadID != 0:
-		opts = append(opts, Topic{ThreadID: c.Message().ThreadID})
+		opts = append(opts, &Topic{ThreadID: c.Message().ThreadID})
 	}
 
 	return opts
 }
 
 func (c *nativeContext) SendAlbum(a Album, opts ...interface{}) error {
-	opts = c.inheritOpts(opts)
+	opts = c.inheritOpts(opts...)
 
 	_, err := c.b.SendAlbum(c.Recipient(), a, opts...)
 	return err
@@ -465,7 +469,7 @@ func (c *nativeContext) Reply(what interface{}, opts ...interface{}) error {
 	if msg == nil {
 		return ErrBadContext
 	}
-	opts = c.inheritOpts(opts)
+	opts = c.inheritOpts(opts...)
 	_, err := c.b.Reply(msg, what, opts...)
 	return err
 }
@@ -485,7 +489,7 @@ func (c *nativeContext) ForwardTo(to Recipient, opts ...interface{}) error {
 }
 
 func (c *nativeContext) Edit(what interface{}, opts ...interface{}) error {
-	opts = c.inheritOpts(opts)
+	opts = c.inheritOpts(opts...)
 
 	if c.u.InlineResult != nil {
 		_, err := c.b.Edit(c.u.InlineResult, what, opts...)
@@ -499,7 +503,7 @@ func (c *nativeContext) Edit(what interface{}, opts ...interface{}) error {
 }
 
 func (c *nativeContext) EditCaption(caption string, opts ...interface{}) error {
-	opts = c.inheritOpts(opts)
+	opts = c.inheritOpts(opts...)
 
 	if c.u.InlineResult != nil {
 		_, err := c.b.EditCaption(c.u.InlineResult, caption, opts...)

options.go

@@ -120,6 +120,8 @@ func (b *Bot) extractOptions(how []interface{}) *SendOptions {
 			}
 		case *ReplyParams:
 			opts.ReplyParams = opt
+		case *Topic:
+			opts.ThreadID = opt.ThreadID
 		case Option:
 			switch opt {
 			case NoPreview:
@@ -152,8 +154,6 @@ func (b *Bot) extractOptions(how []interface{}) *SendOptions {
 			opts.ParseMode = opt
 		case Entities:
 			opts.Entities = opt
-		case Topic:
-			opts.ThreadID = opt.ThreadID
 		default:
 			panic("telebot: unsupported send-option")
 		}