Fixed bug with vision when standing in doorway

src/engine/simulation/simulation.ts

@@ -2,7 +2,7 @@ import type { World, EntityId, Action, SimEvent, Actor, CombatantActor, Collecti
 import { calculateDamage } from "../gameplay/CombatLogic";
 
 import { isBlocked, tryDestructTile } from "../world/world-logic";
-import { isDestructibleByWalk } from "../../core/terrain";
+import { isDestructibleByWalk, TileType } from "../../core/terrain";
 import { GAME_CONFIG } from "../../core/config/GameConfig";
 import { type EntityAccessor } from "../EntityAccessor";
 import { AISystem } from "../ecs/AISystem";
@@ -102,8 +102,25 @@ function handleMove(w: World, actor: Actor, action: { dx: number; dy: number },
     const events: SimEvent[] = [{ type: "moved", actorId: actor.id, from, to }];
 
     const tileIdx = ny * w.width + nx;
-    if (isDestructibleByWalk(w.tiles[tileIdx])) {
-      tryDestructTile(w, nx, ny);
+    const tile = w.tiles[tileIdx];
+    if (isDestructibleByWalk(tile)) {
+      // Only open if it's currently closed.
+      // tryDestructTile toggles, so we must be specific for doors.
+      if (tile === TileType.DOOR_CLOSED) {
+        tryDestructTile(w, nx, ny);
+      } else if (tile !== TileType.DOOR_OPEN) {
+        // For other destructibles like grass
+        tryDestructTile(w, nx, ny);
+      }
+    }
+
+    // Handle "from" tile - Close door if we just left it and no one else is there
+    const fromIdx = from.y * w.width + from.x;
+    if (w.tiles[fromIdx] === TileType.DOOR_OPEN) {
+      const actorsLeft = accessor.getActorsAt(from.x, from.y);
+      if (actorsLeft.length === 0) {
+        w.tiles[fromIdx] = TileType.DOOR_CLOSED;
+      }
     }
 
     if (actor.category === "combatant" && actor.isPlayer) {