December 16, 2015 Patch (Test)

{{Patch layout
 * source = http://dev.dota2.com/showthread.php?t=186442
 * source-title = Update 4
 * before = December 15, 2015 Patch (Test)
 * after =
 * notes =

Update 4
}}
 * Fixed some performance issues.
 * Fixed hitting units in Fog of War.
 * 's now resets cooldown times correctly when purged.
 * Added Cast Range to the tooltip of.
 * Fixed not applying  when using a stolen  with.
 * Fixed some map exploits with Ironwood Trees around Roshan and the Fountain.
 * 's intelligence steal via now creates a single buff/debuff showing the amount of intelligence stolen rather than multiple individual buffs/debuffs
 * Fixed various missing tooltips.
 * Fixed with.