dd1a309cb6
We had multiple copies of the code to position a drag actor given a particular source. Instead, just put it inside dnd.js. Second, rather than test for GenericDisplay/WellDisplayItem etc., in various places, add a new method on each source "shellWorkspaceLaunch" which both marks the item as being droppable on a workspace, and is called by the workspaces code to launch the item.
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