findEventRange in shadow-DOM: "Cannot resolve a Slate point from DOM point", in Chrome

[kledk]

Description I have an editor in a shadow-dom root. When using onMouseDown and calling findEventRange with the associated event an "Cannot resolve a Slate point from DOM point" is thrown, when Chrome. I have tried in firefox, confirming that it works.

Recording

Sandbox https://codesandbox.io/s/sweet-wilson-u19ved?file=/src/App.tsx:738-752

Steps To reproduce the behavior:

1. Go to sandbox
2. Click on the text in the editor
3. See error

Expectation Not throwing when in shadow-dom.

Environment

• Slate Version: 0.82.1
• Operating System: osx
• Browser: Chrome

Context I found that findEventRange, calls document.caretRangeFromPoint in chrome, but I suspect that it gives misleading results in chrome.

[yume-chan]

https://crbug.com/388976#c34 Looks like caretRangeFromPoint doesn't work in ShadowDOM.