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refs 2334

- Update columnWidthCache in ControlListener. There, getWidth() seems to always return the true width, and hence the workaround from the last commit is no longer needed (and the width is cached in all cases).
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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.
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. 

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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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refs 2235

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

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