Bug 403664 - Enable DoubleClickFeature on the diagram background

* Create the GFMarqueeDragTracker directly in
ScalableRootEditPartAnimated instead of in GFPanningSelectionTool
* GFPanningSelectionTool is deleted since it's used no more
* ScalableRootEditPartAnimated now handles the open request.

Change-Id: I78cc6641b2e26e116c3ced4e817d2a949dc2f39a
8 files changed
tree: 2fc8529c682d78264b0f16765e1c6024b3e4e051
  1. examples/
  2. features/
  3. plugins/
  4. releng/
  5. tests/