Adguard does not filter pages with Content-Type:application/xhtml

[Alex-302]

AdguardTeam/AdguardFilters#1028

Example:
us.battle.net

[confessor-adguard]

Known issue.

Content-Type:application/xhtml+xml;charset=UTF-8

[confessor-adguard]

This issue migrates into 6.1 milestone.

We have some compatibility problems now:

Uncaught SyntaxError: Failed to set the 'innerHTML' property on 'Element': The provided markup is invalid XML, and therefore cannot be inserted into an XML document.
    v.extend.clean @ Adguard Assistant?rand=635888115703473421:345
    v.buildFragment @ Adguard Assistant?rand=635888115703473421:342
    v.fn.extend.domManip @ Adguard Assistant?rand=635888115703473421:340
    a.fn.extend.domManip @ Adguard Assistant?rand=635888115703473421:392
    v.fn.extend.append @ Adguard Assistant?rand=635888115703473421:335
    loadTemplates @ Adguard Assistant?rand=635888115703473421:182
    loadAssistant @ Adguard Assistant?rand=635888115703473421:182
    (anonymous function) @ Adguard Assistant?rand=635888115703473421:191

P.S. Don't forget to use CDATA for scripts on application/xhtml pages.