FileService: Position change resulting from call to JumpToFilePosition is now logged in NavigationService.
NavigationService: Make suspend/resume statements incremental as suggested to support this.
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3668 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61