Mike Stein made the good point that when the buffer is empty it wasn't clear if the blue area was the positive scrollbar or the negative space within the scrollbar area.
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love.graphics.rectangle('fill', Editor_state.right+15, topy, 30, boty-topy)
love.graphics.rectangle('fill', Editor_state.right+15, topy+5, 30, math.max(boty-topy-10, 5))
end