Deleting Plaintext Emoji as First Character Throws Error

[ragurney]

bug

What's the current behavior?

Inserting an emoji in plain text -- either by using insertText(), copy pasting, or using Mac's emoji picker -- as the first character in the editor, then hitting the left arrow once and hitting backspace results in an error: slate.js:6451 Uncaught TypeError: Cannot read property 'text' of null
Sandbox example:

https://codesandbox.io/s/8zyqw2jy38

This also happens in the Slate.js example editor:

What's the expected behavior?

Allow the backspace, resulting in the replacement character (�). I'd be happy to open a PR if this is indeed a bug.

Thanks!

[brendancarney]

Looks like a bug to me. We'd definitely welcome a PR!