fix villages after terrain_mask

(cherry-picked from commit 6cd9de1)

src/scripting/game_lua_kernel.cpp

@@ -1110,10 +1110,14 @@ int game_lua_kernel::intf_terrain_mask(lua_State *L)
 	}
 
 
-	gamemap mask_map(resources::gameboard->map().tdata(), "");
+	gamemap mask_map(board().map().tdata(), "");
 	mask_map.read(t_str, false);
 	board().map_->overlay(mask_map, loc, rules, is_odd, ignore_special_locations);
 
+	for(team& t : board().teams()) {
+		t.fix_villages(board().map());
+	}
+
 	if (game_display_) {
 		game_display_->needs_rebuild(true);
 	}

src/team.cpp

@@ -422,6 +422,18 @@ void team::write(config& cfg) const
 	cfg["action_bonus_count"] = action_bonus_count_;
 }
 
+void team::fix_villages(const gamemap &map)
+{
+	for (auto it = villages_.begin(); it != villages_.end(); ) {
+		if (map.is_village(*it)) {
+			++it;
+		}
+		else {
+			it = villages_.erase(it);
+		}
+	}
+}
+
 game_events::pump_result_t team::get_village(const map_location& loc, const int owner_side, game_data* gamedata)
 {
 	villages_.insert(loc);

src/team.hpp

@@ -177,6 +177,7 @@ class team
 
 	void write(config& cfg) const;
 
+	void fix_villages(const gamemap &map);
 	game_events::pump_result_t get_village(const map_location&, const int owner_side, game_data * fire_event); //!< Acquires a village from owner_side. Pointer fire_event should be the game_data for the game if it is desired to fire an event -- a "capture" event with owner_side variable scoped in will be fired. For no event, pass it nullptr. Default is the resources::gamedata pointer
 	void lose_village(const map_location&);
 	void clear_villages() { villages_.clear(); }