Don't use PDFView's documentView in some cases, especially for visible rect, as I don't trust this variable on Mavericks.
Don't use PDFView's documentView in some cases, especially for visible rect, as I don't trust this variable on Mavericks.

git-svn-id: 765db44a9620ed55f4f8addfd3c14fe8cd57f6bb@8192 0fceea05-a30d-0410-8a8b-80ef821fb0a1

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