- Use constants in IPageLayout instead of hard-coded String constants to configure views for StoragePerspective.
- Note: ResourceNavigator view is deprecated since Eclipse 3.5! (warning suppressed for now)

- Since partClosed() is triggered when any IWorkBenchPart is closed, the current implementation erroneously removes the EditorActivationListener even if any other view but the "Model Elements" view is closed.
- Hence, use a different approach and in partActivated() check, if the LibraryView's TreeViewer control is disposed

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

- 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

refs 2196

refs 2337

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

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

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

refs 2122

- GSNPositionedEditPartBase*: Avoid code duplication by pushing refreshDecorationFigure() to PositionedEditPartBase
- PositionedEditPartBase.refreshDecorationFigure()
  - Avoid SWT Image leak by reusing the same icons
  - Add more null-checks to implementation
- MarkerViewPart -> column updater: Avoid SWT Image leak by disposing old image before setting a new one

refs 2255

refs 2255

- Add Id, version, and ConQAT tags to XML files

* Mainly documentation cleanup
* Remove some commented out code

org.fortiss.tooling.kernel.internal.storage.eclipse.ModelContext:
org.fortiss.tooling.kernel.utils.EMFResourceUtils:
 - Resolve B.19 issue (numbering scheme as of Aug. 14, <https://af3-developer.fortiss.org/projects/autofocus3/wiki/Check-list_for_Code_Reviews/56>) "Use static imports"
refs 2255

refs 2055

refs 2055

refs 1491,2203

- Instead, ensure that DiagramEditorBase has the focus when a child edit part is added or removed
- This works around #2207 and also the same part of #1491 as with the old workaround
- Summing up:
   - Undo/redo of operations on the model only works if either the NavigatorViewPart or a DiagramEditorBase has the focus
   - This makes sense if the active view provides editable items itself (e.g., the GenericAnnotationView) *and* provides undo/redo (currently not the case for GenericAnnotationView).
   - For other (read-only) view (e.g., Model Markers), this behavior is confusing for the user
refs 2207,1491

refs 1491

refs 2159

refs 2067

refs 2093

refs 2093

refs 2093

refs 2093

refs 2093

refs 2093