Parsing error: -- is parsed as – when pasting block markup from VS Code about gutenberg

[t-hamano]

Thanks for the report. I was also able to reproduce this problem.

The unique HTML and Meta information included in VSCode might be affecting this. It works correctly when copied from the text area in a web browser.

Below is the log recorded in the browser console when pasting.

Received HTML

 <div style="color: #f8f8f2;background-color: #272822;font-family: 'Ricty Diminished', Consolas, 'Courier New', monospace;font-weight: normal;font-size: 25.6px;line-height: 35px;white-space: pre;"><div><span style="color: #88846f;">&lt;!-- wp:heading --&gt;</span></div><div><span style="color: #f8f8f2;">&lt;</span><span style="color: #f92672;">h2</span><span style="color: #f8f8f2;"> </span><span style="color: #a6e22e;">class</span><span style="color: #f8f8f2;">=</span><span style="color: #e6db74;">"wp-block-heading"</span><span style="color: #f8f8f2;">&gt;Heading&lt;/</span><span style="color: #f92672;">h2</span><span style="color: #f8f8f2;">&gt;</span></div><div><span style="color: #88846f;">&lt;!-- /wp:heading --&gt;</span></div></div>

Received plain text:

 <!-- wp:heading -->
<h2 class="wp-block-heading">Heading</h2>
<!-- /wp:heading -->

Processed HTML piece:

 <p>&lt;!-- wp:heading --&gt;</p><p>&lt;h2 class="wp-block-heading"&gt;Heading&lt;/h2&gt;</p><p>&lt;!-- /wp:heading --&gt;</p>

The solution for now would be to switch to the code editor and then paste.