[Rd] saving PDF with multiple diagrams results in crash (PR#8569)

[Alexander.Holzbach@ifr.uni-karlsruhe.de]

Full_Name: Alexander Holzbach
Version: 2.2.0
OS: Mac OS X 10.3.9
Submission from: (NULL) (129.13.186.1)


when i build an area with multiple diagrams (par(mfrow=c(1,3)) ) and try to save
this to a pdf via "save as.." or by setting pdf("filename") r crashes
reproducable.