From a bug report, it was possible
to fall from above the quest locate level to below it even though it has
nondiggable floors (hence no trapdoors or holes to pass through). Since
the game can't verify that it is nondiggable (which could vary on a role
by role basis depending upon their quest descriptions) when it is not the
current level, restrict falling past it only when it hasn't been visited
yet. Impose the same restriction for random level teleport. This enforces
proper sequencing of the quest feedback, which was the more significant
thing that went wrong in the reported case (player finally got the full
locate level message on a return visit, when descending from above, after
having already cleared out that level on his way back up from falling).
Once the locate level has been reached or passed, it is no longer a
barrier to falling or random teleport. (When it is eventually visited,
there's no attempt to remember whether it allows holes, since that
information and the corresponding fall check would need to be extended to
every level in the dungeon. Also, controlled teleport is still allowed to
bypass it even when it hasn't yet been visited, so the "enforces proper
sequencing" claim above is an exaggeration.)
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