[Rd] plot.factor does not work properly (PR#6894)

[x.sole at iconcologia.catsalut.net]

Full_Name: Xavier Sole
Version: 1.9.0
OS: Windows XP/SuSe Linux
Submission from: (NULL) (146.219.19.22)


plot.factor in 1.9.0 shows different results than in R 1.8. Only one bar is
displayed.

plot(factor(rep(1:3,10)))