MC-8187 / 2×2 Surrounded Saplings Fix

[MC-8187] / 2×2 Surrounded Saplings Fix

The 2×2 Surrounding Saplings fix for [MC-8187] allows 2×2 saplings such as spruce,
jungle and dark oak to grow even when completely surrounded on all 4 sides.

How does it work?

Simple, it fixes an offset in TreeFeature.getTopPosition that makes 2×2 trees
check a 3×3 area at the trunk, catching additional blocks that don’t determine
how the tree should grow.

How do I use it?

Simply install [Fabric] or [Quilt] for Minecraft 1.16 and newer,
then install this mod.

Any side effects?

Theoretically, 2×2 trees may spawn more frequently in a given world,
and old builds not expecting 2×2 saplings to grow may suddenly get a surprise.

Any modded trees that are 3×3 may also erroneously check for a 2×2 trunk if it
relies on the generator to filter out whether a space is valid.

Fun facts:

• This mod was written on 1.16.5 and works as is on 1.16 through 1.20.1.
• I wrote this mod using Segoe Script.
• Some hate the compatibility cockroach that is this mod.