water smooth lighting

forge.java

@Mixin(value = BlockInfo.class, remap = false)
public class MixinBlockInfo {

  @Redirect(
      method = "updateLightMatrix",
      at = @At(
          value = "INVOKE",
          target = "Lnet/minecraft/block/Block;isTranslucent()Z",
          opcode = Opcodes.INVOKEVIRTUAL
      )
  )
  public boolean updateLightMatrix__isTranslucent(final Block block) {
    return !block.isVisuallyOpaque() || block.getLightOpacity() == 0;
  }
}

vanilla.java

@Mixin(targets = "net.minecraft.client.renderer.BlockModelRenderer.AmbientOcclusionFace")
public class MixinBlockModelRenderer {

  @Redirect(
      method = "updateVertexBrightness",
      at = @At(
          value = "INVOKE",
          target = "Lnet/minecraft/block/Block;isTranslucent()Z",
          opcode = Opcodes.INVOKEVIRTUAL
      )
  )
  public boolean updateVertexBrightness__isTranslucent(final Block block) {
    return !block.isVisuallyOpaque() || block.getLightOpacity() == 0;
  }
}