Slate selection doesn't update when dragging browser selection focus into contentEditable={false} element

[TyMick]

Description

When I drag my browser selection focus into a contentEditable={false} DOM element that's being rendered by a non-void Slate element renderer, Slate's selection doesn't get updated. At times, this causes non-highlighted text to be deleted when pressing Backspace (first recording below). At other times, this causes a Backspace press to crash the page (second recording below).

Recording

Sandbox

https://www.slatejs.org/examples/check-lists

Expectation

In the above recordings, that only the visually highlighted text would be deleted on Backspace and that the page would not crash.

Environment

• Slate Version: main (confirmed locally with 7e77a93)
• Operating System: Windows 11
• Browser: Chrome, Firefox

Context

I'm in the process of working on a fix, since this bug affects my project (we have a block type that renders a larger contentEditable={false} element above its text content, so it's a bit easier to trigger). I'll submit a PR once that's ready; just wanted to give y'all a heads-up here first.