bug#55978: 29.0.50; shell-resync-dirs inf-loops if tty outputs CRNL

[miha]

In M-x shell, execute "stty -nl" to make the tty translate \n into \r\n
on output, and press "M-RET" (shell-resync-dir).

Best regards.

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo 
version 1.17.6)
 of 2022-06-14 built on
Repository revision: 175bc8e5a53740432c844b5aae1981d4f47c96f7
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --without-libsystemd'

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RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11
XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
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Major mode: Shell

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Load-path shadows:
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