Re: -Tmarkdown: don't wrap mailtos in <>

["Anthony J. Bentley" <anthony@anjbe.name>]

Hi Ingo,

Ingo Schwarze writes:
> Your diff is very wrong and completely breaks .Mt hyperlinking.

Indeed, you're right. In my defense, there are a couple of reasonable(?)
factors that led to my misunderstanding here:

 - Markdown parsers I've encountered (and GitHub in particular) do
   hyperlink email addresses automatically without <>; I neglected to
   check the spec, as it never occurred to me that Markdown parsers
   might exist that don't do this. Mea culpa.

 - The regression test output mdoc/Aq/author.out_markdown gets
   misinterpreted in Markdown parsers, including try.commonmark.org,
   as <addr> gets passed through as an HTML tag.

 - The regression test mdoc/Mt/simple.in behaves differently between
   output formats: in -Thtml, "Mt ." is hyperlinked, and in -Tmarkdown,
   it is not, at least in CommonMark and GitHub.

The second point seems particularly problematic: any Mt whose argument
doesn't contain '@' seems to be passed through common Markdown parsers
as an HTML tag. Like, say,

.Aq Mt pre

or

.Aq Mt "link rel=stylesheet href=https://example.com/malicious.css"

Is this something we should be worried about? Are there other macros a
crafty manual could use to inject arbitrary HTML into Markdown output?

-- 
Anthony J. Bentley
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