Java Edition 15w45a

15w45a is the thirty-ninth snapshot released for 1.9.

Additions

 * Realms
 * Added a Realms Notifications toggle to the Options menu, toggleable to ON and OFF.

Changes

 * Optimizations
 * Tweaks to pathfinding and monster-AI.
 * Some performance optimisations.
 * Achievements
 * Overpowered is changed from "Build a Notch Apple" to "Eat a Notch Apple".
 * Elder Guardians
 * Rare drops now only provide fish, eliminating fishing treasure and fishing junk. This reverts the mob to 1.8 behavior.
 * Lily pads
 * Collision box is raised from $1/4$ pixel to 1 pixel in height.
 * Maps
 * Are crafted at a zoom level of 1:1, as was the case before 15w34a.
 * Can no longer be zoomed in.
 * This reverts maps to 1.8 behavior.
 * Shields
 * Placing a pattern on a shield now consumes the banner.
 * Commands
 * Tab-completed coordinate arguments now become tildes if no block is in focus.
 * NBT tags
 * The  byte tag on ThrownPotion entities has been removed. Instead, the potion will linger if the stored item has an ID of.
 * The following command creates a ThrownPotion lingering potion: