message: Flush file after writing header length fixups, to ensure it's written
diff: @@ -1092,6 +1092,8 @@ StreamWriter *RDCFile::WriteSection(const SectionProperties &props)
  {
  RETURNERROR(ContainerError::FileIO, "Error applying fixup to section header, errno %d", errno);
  }
  +
  + FileIO::fflush(m_File);
  });
  if(modifySectionCallback)
  