only use dashed line for drawing freehand on 10.6, as this is not supported on 10.5
only use dashed line for drawing freehand on 10.6, as this is not supported on 10.5

git-svn-id: 765db44a9620ed55f4f8addfd3c14fe8cd57f6bb@6977 0fceea05-a30d-0410-8a8b-80ef821fb0a1

nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim