Update viewport before monsters cast a beam. Fixes [2533571].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8986 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 8, 2009
V7IXB2LGZN4MCDBPNKKHFZEV6FMQGZXWSJ7I4HG4DBIXH6LHVYLQC
Change contents