[R-SIG-Mac] crash on canceled "Open in Editor" operation

[Parlamis Franklin]

if i hit the "Open in Editor" toolbar button, but then cancel out of  
the dialog box, R crashes.

franklin parlamis

GUI Version 1.17-pre (3779)

 > version
                _
platform       powerpc-apple-darwin8.7.0
arch           powerpc
os             darwin8.7.0
system         powerpc, darwin8.7.0
status         beta
major          2
minor          4.0
year           2006
month          09
day            22
svn rev        39471
language       R
version.string R version 2.4.0 beta (2006-09-22 r39471)