Consider adopting a new XML grammar: XML comment bug due to deprecated atom/language-xml grammar

[tobil4sk]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.76.0
• OS Version: Windows 11/Linux

Steps to Reproduce:

1. Create a new xml document
2. Paste the following xml, or any xml which contains a comment ending in ---> with more than 2 dashes

<test>
<!-- comment --->
</test>

3. View the broken xml highlighting:
   

This issue was previously reported here: in #58076 and #62221, however, the bug reports were moved to the atom/language-xml repository. Over there, a PR was eventually opened to solve the issue: atom/language-xml#101. However, since Atom is now discontinued, the PR will never be merged into the atom/language-xml repository.

To fix this bug, VSCode will have to switch to a different XML grammar, like for PHP (see #162707) and all the other grammars it uses from Atom.

[alexr00]

Looks like the example is not well-formed xml: https://www.w3.org/TR/REC-xml/#sec-comments