- Avoid java.lang.IllegalStateException because EditorActivationListener tries to update the input of LibraryView's TreeViewer widget after it has been closed (disposed)

- Switch to non-deprecated variant of KernelModelElementUtils.getParentElement()

refs 2264

refs 1948

refs 1626

refs 2264

- When inserting copies of objects as a result of a copy&paste operation, the inserted model elements is shifted by an offset. This gives visual feedback to the user that the paste operation has actually been performed.
- Notes:
 + Some model types are not handled yet (see ticket)
 + Although maybe an obvious approach, this feature cannot be implemented as a method in HierarchicElementCompositorBase:
   o It is not the base class of all affected compositors
   o HierarchicElementCompositorBase resides in org.fortiss.tooling.base, where as the required methods for detailing with layout information are in org.fortiss.tooling.base.ui
refs 2344

refs 1948

refs 2229

- doCompositorBasedDelete(): Sort list of deletion targets such that object whose eContainer() is not contained in 'targets' are deleted first (e.g., free connectors in hierarchical element models).
- This is required to avoid an NPE when the GUI is refreshed while the list of object to be deleted is processed.

refs 2231

refs 2262

refs 2304

refs 2304

- Ensure that in each session, the hint how to create new connections is displayed until the user has managed to create three of them.
- (Side note): The current implementation cannot distinguish connections created interactively by the user, and connections created by a model-transformations. However, we can assume that a user who is able to issue a model-transformation also knows how to create a channel in the GUI.
refs 2229

refs 2196

refs 2126

refs 2126

refs 2337

canPaste is checked inside canPasteInto to forbid pasting stated inside other states selected in the editor.
refs 2337

refs 2337

refs 2337

disabled Delete when trying to delete the background of the editor.
refs 2202

refs 2310

- Ignore update of IDs that may be triggered massively when saving a model that contains a lot of generated artifacts for which IDs are typically not assigned.
- Disabling the delivery of notifications during the assignment of IDs is not possible since the kernel needs to be notified about ID changes.	
refs 2309

refs 2309

- Delete also resources that contain references to the resource managed by the kernel (e.g., the AF3 project)
refs 2309

- This fixes the bug that the TreeMap suffers from collisions of identity hashes.
- The special properties of IdentityHashMap that it uses references equality (instead
  of equals()) to decide collisions is not needed here, but it also does not harm since
  this is the default implementation of equals(), and per definition there cannot be
  two equal elements (at the XMI resource level).
refs 2309

- Prefer the potentially a bit less efficient but safer Display.getDefault.syncExec() over Display.getDefault.asyncExec() to avoid NPEs triggered by model modifications
refs 2323

- Ensure that UI updates triggered from EMF notification mechanism are executed in the UI context (using Display.getDefault.asyncExec())
refs 2323

refs 2240

- Support sharing the ResourceSet used to load models managed by the kernel with additional model files (e.g., models, that are linked to the model managed by the kernel using IDs)
  - Save all resources in the ResourceSet when the model managed by the kernel is saved
  - Update ResourceSet when file used to persist Resource not managed by the kernel is removed from the file system
refs 2309

- Keep registration of these constraint checkers for FileProject objects in org.fortiss.af3.project
refs 2309

- Move internal.storage.Eclipse.AF3ResourceFactory -> utils.ResourceUtils.KernelResourceFactory
- Move registration of KernelResourceFactory for .af3_23 files to org.fortiss.af3.project
- Remove registration for .sfit files (should be handled in an appropriate plugin there)
refs 2309

 - In case the label could not be found, return a string representation of the value. This is useful to implement custom label providers for model elements are edited in combo boxes.
 - Prevent potential NPE