Bukkit/CraftBukkit — pull request #1307 by IvanTheBuilder (2013-12-28 21:11:05+00:00)
Title: Add InventoryClickEvent for one-slot dragging (Fixes BUKKIT-5244)

When placing down an item but leaving your left/right mouse button pressed while shifting more than one pixel triggers an inventory drag, even though the player just wanted to place that item down. This fires an InventoryClickEvent next to the InventoryDragEvent to fix this issue.