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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- Consider both text and image contents in the MeasureItem and PaintItem Listener installed in addRowHeightListener()
- Improve documentation
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- Make update(IModelElement modelElement) more robust by tolerating null input which might occur during model modifications
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- 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.
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- 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. 

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- removed all redundant classes AbstractDecoratedComplexCellWithTextStyledTextActionHandlerDatabindingEditingSupport, AbstractComplexCellWithTextStyledTextActionHandlerDatabindingEditingSupport, AbstractComplexCellDatabindingEditingSupport
- changed DataStateValueEditing Support so that complex cells are still supported
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- Switch to non-deprecated variant of KernelModelElementUtils.getParentElement()

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- 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
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- 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.
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