we should always stop file update checking when resetting, as the fileURL may be set to nil
we should always stop file update checking when resetting, as the fileURL may be set to nil

git-svn-id: 765db44a9620ed55f4f8addfd3c14fe8cd57f6bb@8439 0fceea05-a30d-0410-8a8b-80ef821fb0a1

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