Fixed recompressing of stale files

fs.go

@@ -1141,7 +1141,10 @@ func (h *fsHandler) openFSFile(filePath string, mustCompress bool) (*fsFile, err
 			return nil, fmt.Errorf("cannot obtain info for original file %q: %s", filePathOriginal, err)
 		}
 
-		if fileInfoOriginal.ModTime() != fileInfo.ModTime() {
+		// Only re-create the compressed file if there was more than a second between the mod times.
+		// On MacOS the gzip seems to truncate the nanoseconds in the mod time causing the original file
+		// to look newer than the gzipped file.
+		if fileInfo.ModTime().Sub(fileInfoOriginal.ModTime()) >= time.Second {
 			// The compressed file became stale. Re-create it.
 			f.Close()
 			os.Remove(filePath)