Operating system: Linux-5.4.0-14-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 960/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.64
Broken: version: 2.90 (sub 0), branch: master, commit date: 2020-05-07 21:33, hash: rBc6cda3c09cd0
Broken in all 2.8x too
Short description of error
The last operator panel only grays out if the compositor tab is open and "use nodes" is enabled. If you close the window for the compositor or turn off "Use nodes", the issue doesn't occur.
Here a video with an example with Smooth Vertices, but the problem can occur with any action showing operator panel:
Exact steps for others to reproduce the error
- Open file.
- Move vertices or do some action, so you can open Adjust Last Operation panel
- Open Adjust Last Operation panel
- Click on arrow to change numerical value
All fields are grayed out until cursor leaves "hot area"