Merge pull request #1893 from microsoft/milestones/m267.3

Release M267 (3)

Author: mjcheetham

GVFS/GVFS.Common/GVFSConstants.cs

@@ -13,6 +13,7 @@ public static partial class GVFSConstants
         public const char GitCommentSign = '#';
 
         public const string PrefetchPackPrefix = "prefetch";
+        public const string InProgressPrefetchMarkerExtension = ".incomplete";
 
         public const string GVFSEtwProviderName = "Microsoft.Git.GVFS";
         public const string WorkingDirectoryRootName = "src";