Module marks 

Marks a surface draws over the things on it while a person picks them: the band a drag sweeps out, and the ring around what is selected. One look for every surface that selects by dragging (the workspace canvas, a board, a slide), from the theme’s selection colours.

Functions

paint_selected_ring

The ring around a selected object of radius on a surface: the accent, twice the drag line wide, just outside the object so it never covers it.

paint_selection_band

The selection band a drag sweeps out over a surface: the selection tint with an accent edge, line wide (the theme’s drag line).