Operating system: Windows 10
Graphics card: GeForce 980ti
Broken: 2.80 beta, 4c31bed6b46, 2018-11-30
Short description of error
Select Linked "Delimits" do not work or update in "Edit Mode".
Exact steps for others to reproduce the error
Cut edges with seams. That you have isolated islands of polygons.
Assign different materials to different polys.
Select any poly and press shortcut shift+L.
Go to option and select delimits.
In my case, nothing will happen.