updated for version 7.4.274

Problem:    When doing ":update" just before running an external command that
            changes the file, the timestamp may be unchanged and the file
            is not reloaded.
Solution:   Also check the file size.

src/fileio.c

@@ -6897,6 +6897,7 @@ buf_check_timestamp(buf, focus)
 	    && buf->b_mtime != 0
 	    && ((stat_res = mch_stat((char *)buf->b_ffname, &st)) < 0
 		|| time_differs((long)st.st_mtime, buf->b_mtime)
+		|| st.st_size != buf->b_orig_size
 #ifdef HAVE_ST_MODE
 		|| (int)st.st_mode != buf->b_orig_mode
 #else