In Cinnamon deskop, how to remove this dashed line, that supposedly wants to indicate that the items in the window are not all visible and you can scroll up or down? For example in nemo when there is a big folder where u need to scroll down, in the bottom of the white area is a dashed line. Same in all windows.A screenshot example of system settings:
Dashed line on top and below a window when window scrolling is required
window manager;cinnamon