all: Add a global change list

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3694

lib/scanner/walk.go

@@ -326,6 +326,7 @@ func (w *walker) walkRegular(relPath string, info os.FileInfo, fchan chan protoc
 		NoPermissions: w.IgnorePerms,
 		ModifiedS:     info.ModTime().Unix(),
 		ModifiedNs:    int32(info.ModTime().Nanosecond()),
+		ModifiedBy:    w.ShortID,
 		Size:          info.Size(),
 	}
 	l.Debugln("to hash:", relPath, f)
@@ -361,6 +362,7 @@ func (w *walker) walkDir(relPath string, info os.FileInfo, dchan chan protocol.F
 		NoPermissions: w.IgnorePerms,
 		ModifiedS:     info.ModTime().Unix(),
 		ModifiedNs:    int32(info.ModTime().Nanosecond()),
+		ModifiedBy:    w.ShortID,
 	}
 	l.Debugln("dir:", relPath, f)