Sidebar blinking

[NickOveracker]

Small description
The top few bullet-points in the Directory Sheet sidebar blink each time the selected cell changes.

Expected result
No blinking.

Actual result with screenshot
If you get an unexpected error, please include the full stack trace that you get with Ctrl-E.
YouTube demo

Steps to reproduce with sample data and a .vd
Open a directory in vd and navigate the directory sheet.

No commands other than the automatically-invoked "open-file".

Additional context
VisiData v3.0.2
Python 3.8.0
Ubuntu 18.04.6 LTS (64-bit)

Memory: 125.4GiB
Processor: Intel Core i9-7920X CPU @ 2.90GHz x 24
Graphics: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2

[midichef]

Thanks for including video, as it was very helpful in diagnosing the problem. The likely cause of this bug is discussed in #2352. I expect it will be fixed by 4ed4fb1.