GridView rendering issue on mac os

[vyalovvldmr]

Environment:

1. Mac OS 11.6.3
2. Standart terminal
3. fish shell

Steps to reproduce:

1. pip install onx
2. open terminal in a small window size
3. Run onx -g14

Result:

Source code: https://github.com/vyalovvldmr/onx/blob/c8b477cf4d552dfca38ee169cd973ae0971ccdfc/run.py

I will be grateful for any advice of better code implementation with textual. Which will let me avoid the rendering problem or reduce the impact.