Show portal opening animation in town

Source/msg.cpp

@@ -2123,7 +2123,7 @@ size_t OnActivatePortal(const TCmd *pCmd, size_t pnum)
 					}
 				}
 				if (addPortal) {
-					AddWarpMissile(pnum, position);
+					AddWarpMissile(pnum, position, false);
 				}
 			} else {
 				RemovePortalMissile(pnum);

Source/portal.cpp

@@ -47,13 +47,15 @@ void SetPortalStats(int i, bool o, int x, int y, int lvl, dungeon_type lvltype,
 	Portals[i].setlvl = isSetLevel;
 }
 
-void AddWarpMissile(int i, Point position)
+void AddWarpMissile(int i, Point position, bool sync)
 {
 	MissilesData[MIS_TOWN].mlSFX = SFX_NONE;
 
 	auto *missile = AddMissile({ 0, 0 }, position, Direction::South, MIS_TOWN, TARGET_MONSTERS, i, 0, 0);
 	if (missile != nullptr) {
-		SetMissDir(*missile, 1);
+		// Don't show portal opening animation if we sync existing portals
+		if (sync)
+			SetMissDir(*missile, 1);
 
 		if (leveltype != DTYPE_TOWN)
 			missile->_mlid = AddLight(missile->position.tile, 15);
@@ -68,20 +70,20 @@ void SyncPortals()
 		if (!Portals[i].open)
 			continue;
 		if (leveltype == DTYPE_TOWN)
-			AddWarpMissile(i, WarpDrop[i]);
+			AddWarpMissile(i, WarpDrop[i], true);
 		else {
 			int lvl = currlevel;
 			if (setlevel)
 				lvl = setlvlnum;
 			if (Portals[i].level == lvl && Portals[i].setlvl == setlevel)
-				AddWarpMissile(i, Portals[i].position);
+				AddWarpMissile(i, Portals[i].position, true);
 		}
 	}
 }
 
 void AddInTownPortal(int i)
 {
-	AddWarpMissile(i, WarpDrop[i]);
+	AddWarpMissile(i, WarpDrop[i], false);
 }
 
 void ActivatePortal(int i, Point position, int lvl, dungeon_type dungeonType, bool isSetLevel)

Source/portal.h

@@ -24,7 +24,7 @@ extern Portal Portals[MAXPORTAL];
 
 void InitPortals();
 void SetPortalStats(int i, bool o, int x, int y, int lvl, dungeon_type lvltype, bool isSetLevel);
-void AddWarpMissile(int i, Point position);
+void AddWarpMissile(int i, Point position, bool sync);
 void SyncPortals();
 void AddInTownPortal(int i);
 void ActivatePortal(int i, Point position, int lvl, dungeon_type lvltype, bool sp);