minetest/minetest — pull request #760 by sfan5 (2013-06-06 16:45:41+00:00)
Title: Fix being able to sneak on a node with only 1 air space above it

Commonly used for _Sneak+Jump_ "Ladder"
![screenshot_441891317](https://f.cloud.github.com/assets/1042418/619185/27b21e88-cec7-11e2-9f70-7dd1bf6582da.png)