It doesn't work in multi-window setup based on `window.open` and `createPortal`

I want to add react-scan to Electron app that renders into multiple windows from the same JavaScript thread using `const newWindow = window.open` and then `createPortal(, newWindow)`.

In that case react-scan seems not to work at all

https://pietrasiak.com/creating-multi-window-electron-apps-using-react-portals#aad5d08cfa4d413a8ff6979ebe267fa3

I've wrote article on quirks of this setup

eg.
- `instanceof HTMLElement` will not work as it should be `instanceof ownerWindow.HTMLElement`
- highlights div cannot be created like `document.createElement(), document.body.appendChil` - needs `ownerWindow.documentElement`
- it essentially needs one highlighter per window in which react fiber renders

I understand it is quite major edge case, so not expecting it to be adjusted, just wanted to let you know