Tramp with Dired produces unwanted //DIRED// line

[Felix E. Klee]

As discussed in my [question][1] on Emacs Stack Exchange, when
connecting to an old system with an old `ls`, then I get an ugly line at
the end of each Dired buffer:

     //DIRED// 69 70 128 130 188 198 256 266 324 336 394 406

I was assuming that this is an issue with Dired and the old `ls`. I
didn’t think, it’s related to Tramp. However, Michael suggested I post
here, so I do.

Please find attached Tramp’s debug output at `tramp-verbose` level 6,
with the server and user name anonymized.

  * Tramp version: 2.4.3.27.1

  * `ls` version: ls (GNU fileutils) 3.16

[1]: https://emacs.stackexchange.com/q/64083/5327

debug_buffer.gz
Description: GNU Zip compressed data