The top of blocks are now collided with correctly

[jasonw4331]

Introduction

Block collisions for the blocks directly below the player will now take effect when the player is within 3/16 of the block.

Relevant issues

• Fixes No damage when standing on top of a cactus #2731
• Fixes Magma blocks don't work any more #2041

Changes

API changes

N/A

Behavioral changes

N/A

Backwards compatibility

N/A

Follow-up

N/A

Tests

In-game testing shows standing on cactus and magma blocks damages the player.
Standing on trapdoors and half slabs does not damage the player.
Standing on carpets will damage the player, matching vanilla.

[dktapps]

please don't put special characters in your branch name; this makes it a pain in the ass to checkout in a bash shell.

This change causes other unexpected behaviour, such as getting set on fire when standing on a block adjacent to the fire.

[jasonw4331]

This fix is going to require a more complicated solution... I think I'll attempt it another time 🤔