Async decorations: redecorate() causes cursor jump

[irynakoshynska]

I'm calling editor.api.redecorate() after an async request to update decorations. The decorations update correctly, but the cursor jumps to a different position.

CodeSandbox: https://codesandbox.io/p/sandbox/crazy-dubinsky-l63jdj
Steps to reproduce:

1. Edit decorated text
2. After 500ms, async request completes and calls redecorate()
3. Cursor jumps to a different position

Questions:
What's the recommended way to update decorations after an async request without cursor jump?

[zbeyens]

Tracked here ianstormtaylor/slate#5987