indented code block's "range" doesn't cover indent

[ModProg]

AFAICT for the other tags, even the related fenced code block the start tag starts at the end of the previous token, the content will then be covered by the following text nodes.

For indented code blocks, the leading indent is currently not part of the token's span.

I'd expect this to be correct:

use pulldown_cmark::Parser;
let text = "    code";
let range = Parser::new(text).into_offset_iter().next().unwrap().1;
assert_eq!(range, 0..8);