message: fix line zorder
diff: @@ -126,7 +126,7 @@ class BaseViewer(Viewer):
  def drawPoint2d(self, point2d, color, alpha):
  pass
  - def drawLine2d(self, line2d, color, alpha, line_style=None, zorder=1):
  + def drawLine2d(self, line2d, color, alpha, line_style=None, zorder=10):
  pass
  def drawPolygon2d(self, polygon, color, alpha, facecolor=None):
  