Java Edition 12w34a

12w34a is the second snapshot released for 1.4.2.

Additions
Settings.
 * Decorations
 * Added item frames.
 * Crafted like a painting but with leather instead of wool.
 * Added cobblestone wall and mossy cobblestone wall.
 * Added flower pot.
 * Carrots and Potatoes
 * Added carrots and Golden carrots
 * Added potatoes, Baked potatoes and Poisonous potatoes
 * Carrots and potatoes can be planted in tilled soil.
 * Zombies have a chance to drop a carrots and potatoes.
 * Wooden buttons
 * Arrow-sensitive.
 * Withers
 * Only available through external modification such as editing mob spawners, mods, or hacks. It shoots exploding projectiles called Wither Skulls and destroys nearby blocks. It also has a boss health bar.
 * Potions
 * Added potion of night vision.
 * Potion of night vision is brewed by adding a golden carrot to an awkward potion.
 * Added potion of invisibility.
 * Potion of invisibility is brewed by adding a fermented spider eye to a potion of night vision.
 * Mobs do not attack you until you bump into them.
 * Potion also hides the player's name tag.
 * Settings
 * Added new Full-screen toggle to the Video
 * Added new use Vsync toggle in the Video Settings.
 * Added an unused texture in gui/items.png.

Changes

 * Maps
 * Maps now align to a grid, making it easier to create adjacent maps.
 * A compass and paper do now create an empty map
 * An empty map has no data on it until you right click with it. The point on your world where you right clicked it is the map's center
 * A map (with data) can be cloned. Cloned maps are stackable
 * Maps can be zoomed out (but not zoomed in)
 * Stairs
 * Stairs now auto-arrange into corners. This is a test and may change based on feedback.
 * Dyes
 * Leather armor can be dyed.
 * The default color of leather has changed.
 * You can right-click a full cauldron with dyed armor to remove dye.
 * Tamed wolves' collars can be dyed.
 * Debug screen
 * The f: item on the F3 debug screen now shows the exact direction the player is looking, between -180 and 180 degrees from south.
 * F3+P will toggle the auto-pause when the window loses focus (mainly for debugging).
 * F3+H will toggle detailed item descriptions (also for debugging).
 * Others
 * Fire spreads differently based on difficulty.
 * Mob grinders now give less XP when you farm them continuously.
 * Saplings now have a smaller hitbox.
 * Mobs (and all other entities) can travel through portals.
 * Fire charges shot from a dispenser or a Blaze create the "fireball" sound effect.
 * Removed the “Work in Progress block” from the Creative menu.
 * The particle effect when a trade with a Villager has been successful has changed.
 * Trapdoors can be placed in top-most position (based on cross-hair aim).
 * TNT will ignite if shot by a flaming arrow.

Fixes
3 bugs fixed


 * Fixed zombies not burning in the sun.
 * Fixed graphical glitch with chests and Ender Chests.
 * Fixed crash bug with beacon blocks.