This provides a better sense of where you can drag to pan the surface.
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love.graphics.rectangle('fill', pane.left-Margin_left, pane.top-Margin_above-5-Line_height-5, Margin_left+App.width(Text_cache[pane.title])+Margin_right, 5+Line_height+5)
love.graphics.rectangle('fill', pane.left-Margin_left, pane.top-Margin_above-5-Line_height-5, Margin_left+Display_settings.column_width+Margin_right, 5+Line_height+5)