los:: recompute LOS after map changes if necessary

complex.cpp

@@ -430,6 +430,7 @@ EX namespace elec {
       drawLightning();
       for(int i=2; i<isize(charges); i++) if(charges[i].fire)
         affect(charges[i].c);
+      recompute_los = true;
       }
     }
   
@@ -2520,6 +2521,8 @@ EX void livecaves() {
       if(hv < 0 && c->wall == waBoat) c->wall = waStrandedBoat;
       if(hv < 0 && c->wall == waSea) c->wall = waNone;
       }
+
+    if(c->wall != old) recompute_los = true;
     }
   
   for(int i=0; i<isize(bringlife); i++) {

environment.cpp

@@ -912,6 +912,8 @@ EX void monstersTurn() {
   for(cell *pc: player_positions())
     history::movehistory.push_back(pc);
 #endif
+
+  if(recompute_los) create_los();
   }
 
 /** check if whirlline is looped, if yes, remove the repeat; may not detect loops immediately */
@@ -945,6 +947,7 @@ enum class los { none, geodesic, geometric };
 EX los lineofsight;
 /** when did we switch the lineofsight mode */
 EX int lineofsightAt;
+EX bool recompute_los = false;
 
 EX map<cell*, int> current_fov; // 1 == seen, 2 = see through
 
@@ -1013,6 +1016,7 @@ EX void create_los() {
         }
       }
     }
+  recompute_los = false;
   }
 
 }