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org.eclipse.gmf.runtime.diagram.ui.editparts.CompartmentEditPart has a specific selection behavior which does not seem to desirable for ChildLabelNodes. It ensures that a compartment may only be selected when its parent edit part already has the focus (see : org.eclipse.gmf.runtime.diagram.ui.editparts.CompartmentEditPart::isSelectable()). This is not necessary the case, and this will result in an exception thrown during setFocus() or setSelection() (with GEF 3.7 which prevent this case). For instance, if one want to create a child label node in a compartment list of an element that doesn't have the focus, as the creation ends with the new element selection, an exception is thrown saying that the element is not selectable: 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:63) at org.eclipse.gef.editparts.AbstractEditPart.setSelected(AbstractEditPart.java:1060) at org.eclipse.gef.SelectionManager.setSelection(SelectionManager.java:273) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setSelection(AbstractEditPartViewer.java:751) at org.eclipse.gmf.runtime.diagram.ui.tools.CreationTool.selectAddedObject(CreationTool.java:158) at org.eclipse.papyrus.diagram.common.service.AspectUnspecifiedTypeCreationTool.performCreation(AspectUnspecifiedTypeCreationTool.java:132) at org.eclipse.gef.tools.CreationTool.handleButtonUp(CreationTool.java:189) at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:1200) at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:301) at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:380) at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:548) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:219) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4163) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3752) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
