going between levels. Also, even stationary monsters can disappear, although only by doing that or getting far out of LOS. (Maybe pacification gives such monsters the power to move, for the sake of peace :) ?)
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6028 c06c8d41-db1a-0410-9941-cceddc491573
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// which it can leave the level, make it start doing so.
if (mon->travel_target == MTRAV_NONE)
// which it can leave the level, and it can move (or at
// least teleport, as a mimic can), make it start doing so.
if (mon->travel_target == MTRAV_NONE
&& !mons_is_truly_stationary(mon))