code-dot-org/blockly-core — pull request #64 by Bjvanminnen (2014-04-15 16:45:51+00:00)
Title: [Finishes #69489928] support attaching child in dragged group of blocks

Currently while dragging a block, we'll check all of that block's connections to see if they have a neighbor they can connect to. This change makes it so that we also check connections of descendants, such that while dragging a group of blocks, and of the blocks in that group can end up connecting to a neighbor.