Java Edition 12w30a

12w30a is the fifteenth snapshot released for 1.3.1.

General

 * Options
 * Snooper Settings
 * Allows the player to toggle whether their data are sent to Mojang for analysis and improvements, shows which data will be sent to Mojang.
 * Added Vertical Synchronization in Video Settings
 * Has to be toggled manually in options.txt
 * Fullscreen mode setting is now persistent
 * Has to be toggled manually in options.txt

Blocks

 * Stairs
 * Stairs, when placed on the upper half of a block's side, will now be placed upside-down.

Mobs

 * Creepers
 * Depending on difficulty, creeper damage is now scaled.
 * Easy: ~50% less damage.
 * Normal: same damage as before.
 * Hard: ~33% more damage than before.
 * “In full diamond armor + hard difficulty a creeper can knock you down to 2 hearts."
 * Creeper explosions, fire charge explosions, and TNT give off a knock back.

World generation

 * Nether
 * Made the Nether less laggy.

Command format

 * /gamemode 3
 * Survival mode's command is now /gamemode 0

General

 * F3 Debug screen
 * In F3 mode, the y coordinate now shows both the feet level and the eye level.


 * Performance
 * Accelerated chunk loading.
 * Decreased lag spike frequency.
 * Made chat work smoothly even when the server is lagging.
 * Decreased unnecessary world updates.
 * Decreased packets sent between client and server.

Fixes
19 bugs fixed


 * Fixed existing signs not showing text.
 * Fixed monster spawners all looking like pig spawners.
 * Fixed +,  +  and  +  not working on Mac OS X.
 * Fixed sneaking players' nameplates not staying hidden when loading the chunks the sneaking players are in.
 * Fixed multiple chunks often not displaying.
 * Fixed higher server-set view distances instantly kicking joining players.
 * Fixed sections above Y = 191 becoming invisible when loading worlds.
 * Fixed not completely generated chunks not updating to visually when walking into them.
 * Fixed compasses not pointing to spawn but to X=8 & Z=8 after respawning.
 * Fixed other players' fishing lines looking like they start from their feet.
 * Fixed a bug with Unbreaking-enchanted tools and destroying blocks.
 * Fixed being able to move LAN servers in the server list and crashing the game.
 * Fixed opening SP worlds to LAN, saving and quitting it leaving the server running and showing up in the server list.
 * Fixed pushing a minecart with the movement keys causing the camera to shake in the direction pressed.
 * Fixed potion effects losing their graphical effects when traveling between dimensions.
 * Fixed Ghast's fireballs getting stuck mid-air when unloading their chunk, might apply to fire charges and blaze's fireballs as well.
 * Fixed the last slot in the opened creative inventory's hotbar being one pixel too short on all but the survival inventory tabs and a few pixels being off on the survival inventory tab.
 * Fixed blocks disappearing when you placing them under yourself and jumping.
 * Fixed the client trying to trample crops instead of letting the server dictate trampling.