ExpressionEditor loses value when user resizes browser window

[gusaiani]

To Reproduce

Steps to reproduce the behavior:

1. Open orders table from a custom question
2. Click on the small grid icon to create custom column
3. Modal will appear and "Field formula" is contenteditable field
4. Type 1+1 (without spaces) as a field formula
5. Click on the description field (notice 1+1 got formatted as 1 + 1) and type "Math" as description
6. Resize the window or open the dev tools
7. All your changes are now gone

Expected behavior

Both inputs' values be preserved when window is resized.

Screenshot:

For more information:

See #15734 for related issues and links to adjacent fixes.

[flamber]

Fixed by #16157