drowning as visible, so we get proper messages when they die.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8727 c06c8d41-db1a-0410-9941-cceddc491573
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if (mons_is_submerged(mon)
|| mon->invisible() && !player_see_invis())
{
if (!player_see_invis() && mon->invisible())