code-dot-org/blockly-core — pull request #56 by bcjordan (2014-03-28 22:23:16+00:00)
Title: Move currently-being-dragged blocks to the front of the canvas [fixes #68327464]

Before: http://screencast.com/t/0wXZtAcL

After (within tests): http://screencast.com/t/tZuuhf0cYQWE