picklesrus e1cd21842a Add a workspace drag surface that blocks and bubble get moved to duri… (#778)
* Add a workspace drag surface that blocks and bubble get moved to during a workspace drag.
The surface is translated using translate3d instead of svg's translate attribute so that
the browser does not have to repaint the entire workspace on every mouse move.
This is very similar to the block drag surface.

* Address code review comments

* add back hasClass_ utility removed in #748 and stop using contains since it is not supported in IE
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Blockly

Google's Blockly is a web-based, visual programming editor. Users can drag blocks together to build programs. All code is free and open source.

The project page is https://developers.google.com/blockly/

Description
The web-based visual programming editor.
Readme Apache-2.0 249 MiB
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