[Bug libstdc++/120548] std::format confuses a negative sign for a thousands digit when formatting floating point numbers

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120548

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Also backported as r13-9753-gf8ae6193b7665a but that didn't appear here for
some reason.

Fixed for 13.5, 14.4 and 15.2