* fixed multithreaded pathing (or I'd like to think so :P)

* added new gml function
* fixed concurrency issue

Author: zerver

rts/Game/UI/HwMouseCursor.cpp

@@ -1,5 +1,5 @@
-#include "Rendering/Textures/Bitmap.h"
 #include "StdAfx.h"
+#include "Rendering/Textures/Bitmap.h"
 
 #ifdef WIN32
 #  include "windows.h"

rts/Game/UI/LuaUI.cpp

@@ -9,6 +9,7 @@
 #include <SDL_keysym.h>
 #include <SDL_mouse.h>
 #include <SDL_timer.h>
+#include "Lua/LuaUnsyncedCtrl.h"
 
 #include "mmgr.h"
 
@@ -27,7 +28,6 @@ using namespace std;
 #include "Lua/LuaConstGame.h"
 #include "Lua/LuaSyncedRead.h"
 #include "Lua/LuaUnsyncedCall.h"
-#include "Lua/LuaUnsyncedCtrl.h"
 #include "Lua/LuaUnsyncedRead.h"
 #include "Lua/LuaFeatureDefs.h"
 #include "Lua/LuaUnitDefs.h"
@@ -477,6 +477,9 @@ void CLuaUI::ShockFront(float power, const float3& pos, float areaOfEffect)
 
 bool CLuaUI::HasLayoutButtons()
 {
+	GML_RECMUTEX_LOCK(lua); // HasLayoutButtons
+	lua_checkstack(L, 2);
+
 	static const LuaHashString cmdStr("LayoutButtons");
 	if (!cmdStr.GetGlobalFunc(L)) {
 		return false; // the call is not defined

rts/Lua/LuaUnsyncedRead.cpp

@@ -3,6 +3,7 @@
 //
 //////////////////////////////////////////////////////////////////////
 
+#include "ExternalAI/Group.h"
 #include <set>
 #include <list>
 #include <cctype>
@@ -22,7 +23,6 @@ using namespace std;
 #include "LuaHandle.h"
 #include "LuaHashString.h"
 #include "ExternalAI/GlobalAIHandler.h"
-#include "ExternalAI/Group.h"
 #include "ExternalAI/GroupHandler.h"
 #include "Game/Camera.h"
 #include "Game/Camera/CameraController.h"