System Information
Operating system: Windows 10 64-bit
Graphics card: Nvidia GeForce GTX 1080Ti
Blender Version
Broken: 4d795cee4938
Short description of error
Setting
layout.use_property_split = True
as recommended in the documentation causes non-responsive file/directory browser button on StringProperty with subtype set to "DIR_PATH". Clicking the button will not open the file browser.
Exact steps for others to reproduce the error
Load and run the script. It creates a panel in Render > Hair Sample Render.