[496057] Add support for advanced custom widgets

1) Add a new reference widget configured using the name of an EReference
2) Add the method getEditingDomain() on EditingContextAdapter
3) Fix a potential NPE with the lifecycle manager providers

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=496057
Change-Id: Ib6597e1df8caa345c5e89fe44a6b40eee30d63e2
Signed-off-by: Stéphane Bégaudeau <stephane.begaudeau@obeo.fr>
90 files changed
tree: 549ec4b1ae06fd78650ebd8021428fb6623827fe
  1. doc/
  2. features/
  3. plugins/
  4. prototypes/
  5. releng/
  6. samples/
  7. tests/
  8. .gitignore