João Távora <joaotavora@gmail.com> writes:

> Thanks, but I (or whoever) added the 1+ there probably did so for 
> a reason.  

It was added by you[1].

> Maybe they were mistaken, but you have to supply a reproduction recipe
> that demonstrates there's a problem with that, so we can check the 
> before and after, else I could be fixing it for you and breaking it for
> someone else.

I've reported some bugs and I'm familiar with (info "(emacs)Bugs").

I did not include a reproduction recipe in this report because I think
it is trivial to reproduce:

1. use a LSP server supporting argument documentation in the signature
help
2. get one signature help with argument documentation from eglot
3. see the highlight of argument documentation is off-by-one

typescript-language-server is mentioned in the commit[1] adding `1+', so
I guess it can be used for reproduction.

I am developing[2] the signature help feature for
haskell-language-server, which causes me to discover this off-by-one
"bug".

I added two screenshots before and after applying my patch as
attachments.