Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Short description of error
The Minimum Grid Spacing adjusts the division of the timeline in the timeline for example. This works fine in 2.79. In Blender 2.80 adjusting this value does nothing.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Open User Preferences, Animation, Timeline tab. Change the Minimum Grid Spacing. Watch the timeline slider in the timeline. It will not change like in 2.79