Guide lines with "draw_active" should be more obvious

[jiyinyiyong]

1. the guide lines are hard to distinguish when using both “draw_normal” and “draw_avctive”
   Setting “draw_active” alone looks better, but there’s a second problem,

2. the indetation lines should base on the caret rather than the line head…
   Using caret if more flexy and I can read more details when comparing different indetantions.