Solved with help from the maintainers:
Setting h=0 in listmenu.lua, here, has the desired effect:
function ListMenu:_updateItemsBuildUI()
-- Build our list
local line_widget = LineWidget:new{
dimen = Geom:new{ w = self.width or self.screen_w, h = Size.line.thin },
background = Blitbuffer.COLOR_DARK_GRAY,
}
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