code-dot-org/blockly-core — pull request #49 by breville (2014-02-06 00:29:36+00:00)
Title: Fix for mouse dragging out of toolbox having unexpected offset.

Dragging items out of toolbox now uses original mouse starting position, rather than position on first mousemove event after drag radius is exceeded. This fixes the issue where a block being dragged is separated from the mouse pointer or finger.