[markdown] underscores in URLs produce italicizing

http://goo.com/_foo bar baz [foo](bar)

gets rendered with the _ starting an italicized section, whereas it should just be part of the URL, as rendered below:

http://goo.com/_foo bar baz foo

[marijnh]

I see. But then is there any reason to expect this underscore not to start an emphasis span? The CommonMark spec suggests treating punctuation (/ in this case) the same as whitespace.

[mtaran-google]

I wasn’t talking about any special highlighting of the URL.

We are currently using this config for markdown mode:

  {
    name: 'markdown',
    underscoresBreakWords: false,
    fencedCodeBlocks: true,
    strikethrough: true
  },

The problem, as described above, is that when you paste my example into https://codemirror.net/mode/markdown/ the _ starts an italicized section, which here is undesirable. The desired fix would be some adjustment of the tokenization etc. in the markdown mode so that underscores in contexts like this (e.g. preceded by / and maybe other characters) don’t trigger the start of italicizing.