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refs 2446

new factorised gef editor base class
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layout information accessible via singleton interface
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working sub diagrams
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refs 2446

- Add and register {@link RemoveDuplicatedAnnotationsMigrationProvider} that removes duplicated {@link IAnnotatedSpecification}s from a model. These have been observed for a couple of models and might indicate an internal problem.

refs 2446

- Consider both text and image contents in the MeasureItem and PaintItem Listener installed in addRowHeightListener()
- Improve documentation
refs 2450

- Add MigrationUtils: Utility methods for implementation of drop-in replacement migrations of (sub-types of) types defined in org.fortiss.tooling.base.

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refs 2352

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- Make update(IModelElement modelElement) more robust by tolerating null input which might occur during model modifications
refs 2289

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- Remove deprecated method KernelModelElementUtils.getParentElement(EObject, Class). Use KernelModelElementUtils.getParentElement(EObject, Class, boolean) instead.

 - Missing @Override
 - Missing 	/** {@inheritDoc} */
 - Spurious ;
 - Spurious @SuppressWarnings("unchecked")
 - Spurious casts
 - Spurious imports

Move DreamsPlatformUtils.{disableNotificationsOf(), enableNotificationsOf(), setNotificationsOf()} to EcoreUtils

- Use generics for both the element for which the properties section is defined, as well as the target type of the EReference manipulated by this EReferencePropertySectionBase
- Disable ComboBox if the set of possible values is empty

- Add EReferencePropertySectionBase, a base class for a property section that allows to set an {@link EReference} using a {@link ComboViewer}.

- Add computeFullyQualifiedName(INamedElement element, boolean includeTopLevel) that allows to skip the top-level of a name (the FileProject in AF3)
- The behavior of computeFullyQualifiedName(INamedElement element) is preserved to include the name of the top-level element
- Change implementation of computeFullyQualifiedName() and computeRelativeName() to use the a StringBuilder and the prependName() helper method

- AnnotationViewBase: Wrap the update in a asyncExec call again to avoid deadlocks on model transformations.
org.fortiss.af3.mira.ui:
- Solve the reported issue by wrapping the problematic method call in mira.ui into a asyncExec call.
refs 2323

- TreeViewerEditorBase: Wrap the refresh call into a asyncExec method to avoid invalid tread access when a model is modified which is open in a TreeViewer editor. 

- Introduce a separate base class for composing IModelElements. It manages (among other things) the instantiation of annotations.
- Let HierarchicElementCompositorBase inherit from the newly created base class for IModelElements.