--- preview.sty~	2019-06-23 19:00:15.562770000 +0900
+++ preview.sty	2019-06-22 23:53:13.815070000 +0900
@@ -268,9 +268,9 @@
        \splittopskip\z@skip\setbox\z@\vsplit\pr@box to\z@
        \unvbox\z@
        \nointerlineskip
-       %\color@setgroup
+       \color@setgroup
        \box\pr@box
-       %\color@endgroup
+       \color@endgroup
      }%
    \pr@ship@end
    {\let\protect\noexpand