Fix #10206: Disable scripts in intro game (#10241)

src/ai/ai_instance.cpp

@@ -61,6 +61,9 @@ void AIInstance::Died()
 {
 	ScriptInstance::Died();
 
+	/* Intro is not supposed to use AI, but it may have 'dummy' AI which instant dies. */
+	if (_game_mode == GM_MENU) return;
+
 	ShowAIDebugWindow(_current_company);
 
 	const AIInfo *info = AIConfig::GetConfig(_current_company, AIConfig::SSS_FORCE_GAME)->GetInfo();

src/ai/ai_scanner.cpp

@@ -10,6 +10,7 @@
 #include "../stdafx.h"
 #include "../debug.h"
 #include "../network/network.h"
+#include "../openttd.h"
 #include "../core/random_func.hpp"
 
 #include "../script/squirrel_class.hpp"
@@ -59,6 +60,11 @@ void AIScannerInfo::RegisterAPI(class Squirrel *engine)
 
 AIInfo *AIScannerInfo::SelectRandomAI() const
 {
+	if (_game_mode == GM_MENU) {
+		Debug(script, 0, "The intro game should not use AI, loading 'dummy' AI.");
+		return this->info_dummy;
+	}
+
 	uint num_random_ais = 0;
 	for (const auto &item : info_single_list) {
 		AIInfo *i = static_cast<AIInfo *>(item.second);

src/saveload/ai_sl.cpp

@@ -77,7 +77,7 @@ struct AIPLChunkHandler : ChunkHandler {
 			_ai_saveload_version = -1;
 			SlObject(nullptr, slt);
 
-			if (_networking && !_network_server) {
+			if (_game_mode == GM_MENU || (_networking && !_network_server)) {
 				if (Company::IsValidAiID(index)) AIInstance::LoadEmpty();
 				continue;
 			}

src/saveload/game_sl.cpp

@@ -69,7 +69,7 @@ struct GSDTChunkHandler : ChunkHandler {
 		_game_saveload_version = -1;
 		SlObject(nullptr, slt);
 
-		if (_networking && !_network_server) {
+		if (_game_mode == GM_MENU || (_networking && !_network_server)) {
 			GameInstance::LoadEmpty();
 			if (SlIterateArray() != -1) SlErrorCorrupt("Too many GameScript configs");
 			return;