Method setLastActiveId

app/src/AI/ChatStore.cpp:132–139

* @brief Persists the active-chat pointer. */

 * @brief Persists the active-chat pointer.
 */
void AI::ChatStore::setLastActiveId(const QString& id)
{
  if (m_lastActive == id)
    return;

  m_lastActive = id;
  writeIndex();
}

/**
 * @brief Creates a new untitled chat and returns its id.