[PATCH v5 0/1] MR3391: mshtml: implement window.MutationObserver with MutationObserver stub

[Yuxuan Shui (＠yshui)]

This get us pass the "Update your browser" blocker in adobe's sign-in page. The page itself doesn't make use of `window.MutationObserver`.

However the sign-in page is still broken.

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  v5: mshtml: implement window.MutationObserver with MutationObserver stub
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/3391