Support international keyboard

[saenyakorn]

Description

I want to create rich text editor in Thai but it seems like typing in Thai doesn't have a correct behaviour. For example, สวัสดี (Thai greeting word) when I pressed Backspace one time, ดี was deleted (only ี should be deleted)

https://user-images.githubusercontent.com/33742791/145669510-be5e886c-3d35-4a3f-847f-a26b98d7fd82.mov

Expectation

For example, Microsoft word, when I pressed backspace the character should be deleted only one character.

https://user-images.githubusercontent.com/33742791/145669515-1b0f4680-3530-45b7-a78f-30f1edef3866.mov

Note: This bug may not be only for Thai keyboard. Please check for other countries's keyboard too.

Environment

• slate: 0.72.0
• slate-react: 0.72.1
• browser: chrome, brave

Thank you in advance! 😄

Funding

• You can sponsor this specific effort via a Polar.sh pledge below
• We receive the pledge once the issue is completed & verified