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Created attachment 281548 [details] Use case to reproduce Decorations tooltips are not displayed in the diagram editor though the corresponding function is correctly trigerred. Attached is a use case to reproduce.
Indeed, we have a bug in org.eclipse.sirius.diagram.ui.tools.internal.decoration.DescribedDecorationDescriptorProvider.DecorationDescriptorWithLazyTooltip.getTooltipAsString() which use the DDiagramElement instead of the semantic element as parameter. A possible workaround is changing the service signature with DSemanticDecorator as parameter type and it should works.