Describe the bug

Position the Editor's cursor at the start of its text area. Type some text inside an empty Editor and press the Backspace key. The text is not deleted.

If you use the cursor keys or click to reposition the cursor, the Delete and Backspace keys start to work.

To Reproduce

1. Open https://codesandbox.io/s/seb4r5
2. Position the cursor at the start of the Editor (before the word "The")
3. Press the Delete key - instead of text to the right being deleted, nothing happens
4. Type some text before the existing content in the Editor
5. Press the Backspace key - instead of text to the left being deleted, nothing happens

Expected behavior

The Backspace and Delete buttons should work in all Editor scenarios where the text editing is not prevented