Straighten the two cell_see_cell() confusion.

There were two functions: one used no cache and ignored clouds, another one
has a cache and accepts different LOS models.

I added a new cached model: LOS_SOLID (using opc_solid).  All but one uses
of opc_fullyopaque (two-argument cell_see_cell()) were bugs to me, so they
were moved to a different model.

This makes Refrigeration not work through glass walls anymore (it still
works though clouds).

1 files changed, 1 insertions, 0 deletions

diff --git a/crawl-ref/source/losglobal.h b/crawl-ref/source/losglobal.h
index 348e9dd455..18636da218 100644
--- a/crawl-ref/source/losglobal.h
+++ b/crawl-ref/source/losglobal.h
@@ -6,6 +6,7 @@ enum los_type
     LOS_ARENA        = 0,
     LOS_DEFAULT      = (1 << 0),
     LOS_NO_TRANS     = (1 << 1),
+    LOS_SOLID        = (1 << 2),
 };
 
 void invalidate_los_around(const coord_def& p);