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Steps to reproduce : 1. Create a sequence diagram with a lifeline and a message found 2. In the ModelExplorer, activate the "Link With Editor" feature 3. Select the Interaction in the ModelExplorer, you get an exception. Initial description of this bug is available here : https://www.eclipse.org/forums/index.php/t/1110076/ java.lang.IllegalArgumentException: An EditPart has to be selectable (isSelectable() == true) in order to get selected. at org.eclipse.core.runtime.Assert.isLegal(Assert.java:66) at org.eclipse.gef.editparts.AbstractEditPart.setSelected(AbstractEditPart.java:1060) at org.eclipse.gef.SelectionManager.setSelection(SelectionManager.java:308) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setSelection(AbstractEditPartViewer.java:751) at org.eclipse.papyrus.infra.gmfdiag.common.SynchronizableGmfDiagramEditor.revealElement(SynchronizableGmfDiagramEditor.java:177) at org.eclipse.papyrus.infra.gmfdiag.common.SynchronizableGmfDiagramEditor.revealElement(SynchronizableGmfDiagramEditor.java:118) at org.eclipse.papyrus.infra.services.navigation.service.impl.NavigationServiceImpl.navigate(NavigationServiceImpl.java:415) at org.eclipse.papyrus.infra.services.openelement.service.impl.OpenElementServiceImpl$1.run(OpenElementServiceImpl.java:116) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:236) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133) at org.eclipse.swt.widgets.Display.syncExec(Display.java:4779) at org.eclipse.papyrus.infra.services.openelement.service.impl.OpenElementServiceImpl.reveal(OpenElementServiceImpl.java:102) at org.eclipse.papyrus.infra.services.openelement.service.impl.OpenElementServiceImpl.openElement(OpenElementServiceImpl.java:92) at org.eclipse.papyrus.infra.gmfdiag.navigation.ui.DynamicNavigate.revealObject(DynamicNavigate.java:76) at org.eclipse.papyrus.infra.gmfdiag.navigation.ui.DiagramDynamicNavigate$3.widgetSelected(DiagramDynamicNavigate.java:88) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4243) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1060) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4060) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3632) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1154) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1045) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155) at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:644) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:551) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:156) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596) at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
