Implementation of basic multi-touch support about scratch-blocks HOT 4 CLOSED

We played with this on iOS some. It was fun but it made pinch-to-zoom really confusing.

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I think we have most of the desired design resolved.

@rachel-fenichel

• For our web implementation, just fix the implementation for now. Rachel has already made great progress on this, I think.
  • Second drag is ignored in general
  • Touching the workspace doesn't prevent you from dragging a block until the workspace is dragged (e.g., if you put your hand on the workspace and don't move it, you can still drag blocks).
• In the long run, we think it would be nice to have pinch-to-zoom (not dragging multiple blocks with multiple fingers). This is a general feeling of priority for using gestures for navigation over block manipulation (since it's really not necessary to manipulate multiple blocks at a time). Not sure if this is performant enough in the web implementation or not.

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@tmickel @rachel-fenichel Should we close this and track any follow-up work in new tickets?

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Implemented!

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