bug#38940: \x1b]8; ; OSC character displayed on hyperlinks shown after calls to `guix describe` or `guix show` on mate-terminal 1.12.1 (Trisquel 8)

[Jack Hill]

Hi Ludo'

On Thu, 9 Jan 2020, Ludovic Courtès wrote:
1. Instead of INSIDE_EMACS, the variable name NO_SUPPORT_HYPERLINK or
other seems more meaningful. Maybe?

Actually the goal was to remove ‘INSIDE_EMACS’ from there once a
widespread-enough Emacs version supports it, which could be within a
year.  And since other terminals are supposed to ignore it altogether, I
would rather not add a special environment variable.

Which Emacs version support it? I'm using Emacs 26.3 from master, and see 
the escape sequences in eshell. They seem to be correctly ignored in M-x 
shell.

Thanks,
Jack