Html entity < escaped in code block if inside html container

[samuelgfeller]

There is a weird escaping going on in certain cases in code blocks that are inside html tags with markdown="1"
In reality I'm using a <details markdown="1"> tag as container but will use a <p> for the demonstration.

I have set

$markdownParser->setMarkupEscaped(false);

Steps to reproduce

1. Feed this code to parsedown extra v.0.8.1: https://pastebin.com/V9v2mtnk

$output = $ParsedownExtra->text($markdownCodeFromPastebin);
echo $output;

2. Have a look at the generated HTML

Actual result

< converted to < sometimes

The following:

results to this:

Expected result

The code inside a markdown code block should not be escaped as it's expected to be code.

Edit

If I remove the markdown="1" from the p tag the markdown is taken literally as html which I don't understand if this comment meant that markdown inside html tags are supposed to work even without the markdown="1" addition, just like github for instance.

If I remove the html parent block, the markdown code block is interpreted correctly:

[davidbyoung]

This also happens with blockquote sections inside of an HTML element:

<div class="foo" markdown="1">

> **Foo**

</div>

...incorrectly interprets the > as > rather than a blockquote.

[samuelgfeller]

The char & has the same issue.

My fix is creating a ParsedownExtraExtended class that extends ParsedownExtra and overwrites blockFencedCodeComplete and inlineCode functions and replace the escaped chars by their original value:

class ParsedownExtraExtended extends \ParsedownExtra
{
    protected function inlineCode($Excerpt)
    {
        $code = parent::inlineCode($Excerpt);
        $code['element']['text'] = $this->replaceSpecialCharacters($code['element']['text']);
        return $code;
    }

    protected function blockFencedCodeComplete($Block)
    {
        $Block['element']['text']['text'] = $this->replaceSpecialCharacters($Block['element']['text']['text']);
        return $Block;
    }

    protected function replaceSpecialCharacters($text): string
    {
        return str_replace(['&lt;', '&gt;', '&amp;'], ['<', '>', '&'], $text);
    }
}