[PATCH v15 0/2] 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.

--
  v15: mshtml: add stubs for MutationObserver methods
       mshtml: implement window.MutationObserver with MutationObserver stub

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