This fixes some bugs (e.g. Portal spell and nets interact properly.)
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9036 c06c8d41-db1a-0410-9941-cceddc491573
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// no longer held in net
if (newpos != you.pos())
clear_trapping_net();