HTML Comments rendered with additional white space

[gglnx]

Describe the bug
Currently, HTML comments get additional whitespace inside in the beginning and the end: <!--#TEST--> will be transformed to <!-- #TEST -->. CleverReach uses HTML comments as a programming language and doesn't support a space or any other whitespace character between the start of the comment and the command (<!--#loop #--> works, <!-- #loop # --> not).

To Reproduce
Steps to reproduce the behavior:

1. Create a file with this MJML code: <mjml><!--#COMMAND#--></mjml>
2. Render it to HTML and compare it

Expected behavior
Preserving of no or all whitespaces in HTML comments.

MJML environment (please complete the following information):

• OS: MacOS
• MJML Version: 4.15.3
• MJML tool used: mjml-cli

[iRyusa]

Did you tried to wrap in mj-raw those comment ?

[gglnx]

Yes, to temporarily fix it. But I would like to prefer it, that MJML doesn't modify the whitespace inside an HTML comment.

[iRyusa]

Might be fixable as the space might be introduced by this https:/mjmlio/mjml/blob/master/packages/mjml-parser-xml/src/index.js#L315-L326

I'll check later