Anti-aliasing not working in Normal bake The Scene

So in the scene i have a high poly model and a flat plane to which i want to bake the normals on to. The engine i am using here is Blender Render


The Models

Just a flat plane (to which i want to bake the normals on) and the high poly sculpted mesh


The texture settings of the flat plane

Regular normal map settings here, checked the normal in the Influence and checked the normal map option in the Image sampling panel



The Anti-aliasing and Bake settings

Regular normal bake settings with the anti-aliasing turned on.



The Question

As you can see the normal map still has jagged edges despite anti-aliasing being enabled. I baked it multiple times to see if it worked, but still got nothing. They still bake out with jagged lines. I am at the ends of my wit here. How do i fix it ?
TexTools for Blender was recently released (free) which adds an anti-aliasing option for baking.



Internally the add-on just renders at 2x or 4x the size and then down-scales the final bake to the target resolution resulting in anti aliasing. The good thing is that this anti-aliasing works with all bake modes in TexTools.

You can find more information and download links from my website.