Function assign_string_in_place

app/src/DataModel/Frame.h:878–887

* @brief Allocation-free QString copy: reuses the destination buffer when it is unique and * large enough, falling back to an implicit-share assignment otherwise. */

 *        large enough, falling back to an implicit-share assignment otherwise.
 */
SS_FORCE_INLINE void assign_string_in_place(QString& dst, const QString& src) noexcept
{
  const qsizetype n = src.size();
  if (dst.isDetached() && dst.capacity() >= n) {
    dst.resize(n);
    if (n > 0)
      memcpy(dst.data(), src.constData(), static_cast<size_t>(n) * sizeof(QChar));
  } else
    dst = src;
}

/**
 * @brief Writes UTF-8 bytes into a QString, reusing the destination buffer for ASCII payloads. The