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org.eclipse.swt.SWTException: Widget is disposed	at org.eclipse.swt.SWT.error(SWT.java:3374)	at org.eclipse.swt.SWT.error(SWT.java:3297)	at org.eclipse.swt.SWT.error(SWT.java:3268)	at org.eclipse.swt.widgets.Widget.error(Widget.java:650)	at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:327)	at org.eclipse.swt.widgets.Button.setSelection(Button.java:708)	at org.eclipse.gmf.runtime.diagram.ui.properties.sections.appearance.ConnectionAppearancePropertySection$7.run(ConnectionAppearancePropertySection.java:372)	at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:248)	at org.eclipse.gmf.runtime.diagram.ui.properties.sections.AbstractModelerPropertySection.executeAsReadAction(AbstractModelerPropertySection.java:241)	at org.eclipse.gmf.runtime.diagram.ui.properties.sections.appearance.ConnectionAppearancePropertySection.refresh(ConnectionAppearancePropertySection.java:364)	at org.eclipse.gmf.runtime.diagram.ui.properties.sections.appearance.ColorsAndFontsPropertySection$14.run(ColorsAndFontsPropertySection.java:610)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3142)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2912)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)	at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)	at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:169)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)	at org.eclipse.core.launcher.Main.basicRun(Main.java:280)	at org.eclipse.core.launcher.Main.run(Main.java:977)	at org.eclipse.core.launcher.Main.main(Main.java:952)