Fix render size update after render target change. Only happened with some render targets.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3737 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CD3D8Driver.cpp

@@ -790,6 +790,7 @@ bool CD3D8Driver::setRenderTarget(video::ITexture* texture,
 
 		CurrentRendertargetSize = tex->getSize();
 	}
+	Transformation3DChanged = true; 
 
 	if (clearBackBuffer || clearZBuffer)
 	{

source/Irrlicht/CD3D9Driver.cpp

@@ -843,6 +843,7 @@ bool CD3D9Driver::setRenderTarget(video::ITexture* texture,
 			os::Printer::log("Error: Could not set new depth buffer.", ELL_ERROR);
 		}
 	}
+	Transformation3DChanged=true;
 
 	if (clearBackBuffer || clearZBuffer)
 	{