Bug: link_open and link_close Have Different Levels

[ilyaigpetrov]

For input [AA homer.j.simpson@example.com BB](mailto:homer.j.simpson@example.com) link_open and link_close tokens have different levels. I think it may be a bug, otherwise, please, explain it to me why they have different levels.
Markdown-it version: 8.4.1.

'use strict';

const md = require('markdown-it')();

md.core.ruler.push('buggy_levels', (state) => {

  const blockTokens = state.tokens;
  for (let j = 0, l = blockTokens.length; j < l; j++) {
    if (
      !(blockTokens[j].type === 'inline' && blockTokens[j].content.includes('@'))
    ) {
      continue;
    }
    const tokens = blockTokens[j].children;
    console.log('LOOK AT LEVELS:', tokens.map((t) => [t.type, t.level]));

    for (let i = tokens.length - 1; i >= 0; --i) {

      if (tokens[i].type !== 'link_close') {
        continue;
      }
      const linkCloseToken = tokens[i];
      const linkCloseIndex = i;

      do {
        --i;
      } while (!(tokens[i].level === linkCloseToken.level && tokens[i].type === 'link_open'));
      if (!tokens[i].attrGet('href').startsWith('mailto:')) {
        continue;
      }
      console.log('NO BUG ANYMORE!');
    }
  }
});

const input = '[AA homer.j.simpson@example.com BB](mailto:homer.j.simpson@example.com)';
console.log(md.render(input));

Online demo on RunKit

[rlidwka]

It was a bug due to oversight when these levels were re-calculated.

Fixed, thanks for reporting.