Operating system: Linux-5.0.9-2-MANJARO-x86_64-with-arch-Manjaro-Linux 64 Bits
Graphics card: Mesa DRI Intel(R) Sandybridge Mobile Intel Open Source Technology Center 3.3 (Core Profile) Mesa 19.0.3
Short description of error
Drop down with too many items are not usable and some of them are not even selectable.
Exact steps for others to reproduce the error
To reproduce it: the ACES OCIO config file can be used. It has a very long list of items as image/strip input color space and not all of them can be selected because it goes beyond the window area.