Re: [PATCH v3 0/1] MR3391: mshtml: implement window.MutationObserver with MutationObserver stub

[Gabriel Ivăncescu]

Gabriel Ivăncescu (@insn) commented about dlls/mshtml/mshtml_private_iface.idl:
> HRESULT matchMedia([in] BSTR media_query, [retval, out] IDispatch **media_query_list);
>      [id(54)]
>      HRESULT postMessage([in] VARIANT msg, [in] BSTR targetOrigin, [in, optional] VARIANT transfer);
> +    [id(55)]
> +    HRESULT MutationObserver([in] IDispatch *callback, [retval, out] IDispatch **observer);

See comment above to turn it into a getter for the constructor (with named DISPID for the hook maybe).

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https://gitlab.winehq.org/wine/wine/-/merge_requests/3391#note_39943