code-dot-org/blockly-core — pull request #70 by Bjvanminnen (2014-04-29 21:15:54+00:00)
Title: [Finishes #70384866] removeAllRanges throws on IE9

This fixes one of the big hitters of JS errors from New Relic. I copied the fix from https://code.google.com/p/blockly/source/browse/trunk/core/blockly.js.