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- bindDoubleValue() and bindPositiveDoubleValue() use the default of a maximum number of three fractional digits to be shown in a String representation of the value
- Hence, add variants of that function where a custom maximum number of fractional digits to be shown in a String representation of the value can be specified

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- 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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- 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.

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