Default fillstyle for 'set rectangle' is slightly wrong

[Dima K. <gn...@di...>]

Hi. The docs (help fillstyle) say that the default fillstyle is "empty".
But this isn't what's happening:

  set grid
  set object rectangle from 0,0 to 1,1
  plot [-1:2][-1:2] x

Note that the grid lines do not show up behind the rectangle. If I
explicitly add "fillstyle empty" to the rectangle definition, you get
the transparent rectangle.

Thanks!