Need help implementing code

[Probably_True]

Hello all, there's a very old post from mojangs bug reporting website that has remained relevant to this day regarding ambient occlusion. This bug bothers me more than anything and this post states and even shows a fix for the issue, however even in 1.15 this issue has not been officially fixed. Can anyone who knows what they're doing please take a look at this post https://bugs.mojang.com/browse/MC-43968 and let me know how I could go about implementing this fix into my game? The OP of that bug report shows code that fixed the issue and shows before and after screenshots proving that the fix works. I really want don't want to deal with this eyesore any longer so if anyone who knows how to code could either show me how to implement this fix into my game or just straight up make some small mod that does it I would be eternally grateful. Trust me, you have no idea how much this lighting bug has annoyed my ocd for years.

[Cadiboo]

The rendering code has changed massively since 1.7.4 so that snipped of code is no longer usable. However, the intent of the code can still be implemented. I'm not sure how this could be implemented with the current rendering changes (I would wait till 1.15 stabilises before attempting it) but unless the smooth lighting code has changed a lot you would likely be looking at changing AmbientOcclusionFace.

Pictures from MC-43968: