added sender removal.

src/lib.rs

@@ -98,7 +98,9 @@ impl MoreThanText {
             .send(msg.forward(NameType::None, reg_msg))
             .unwrap();
         rx.recv().unwrap(); // Wait for completion.
-        self.recursive_session_request(rx, action, msg)
+        let output = self.recursive_session_request(rx, action, msg);
+        self.queue.remove_sender(&sender_id);
+        output
     }
 
     pub fn get_document(&self) -> String {