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Random exception in the graphic

Reported by Sylvestre LEDRU

Originally assigned to Calixte DENIZET 

I though we already add a bug for this.

From time to time, we get this in the graphic:

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
	at javax.swing.LayoutComparator.compare(LayoutComparator.java:78)
	at java.util.Arrays.mergeSort(Arrays.java:1306)
	at java.util.Arrays.sort(Arrays.java:1223)
	at java.util.Collections.sort(Collections.java:176)
	at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:136)
	at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocusTraversalPolicy.java:451)
	at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:165)
	at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFocusTraversalPolicy.java:528)
	at java.awt.FocusTraversalPolicy.getInitialComponent(FocusTraversalPolicy.java:169)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:371)
	at java.awt.Component.dispatchEventImpl(Component.java:4499)
	at java.awt.Container.dispatchEventImpl(Container.java:2103)
	at java.awt.Window.dispatchEventImpl(Window.java:2517)
	at java.awt.Component.dispatchEvent(Component.java:4455)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
	at java.awt.EventQueue.access$000(EventQueue.java:96)
	at java.awt.EventQueue$1.run(EventQueue.java:608)
	at java.awt.EventQueue$1.run(EventQueue.java:606)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
	at java.awt.EventQueue$2.run(EventQueue.java:622)
	at java.awt.EventQueue$2.run(EventQueue.java:620)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
	at java.awt.SequencedEvent.dispatch(SequencedEvent.java:113)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:647)
	at java.awt.EventQueue.access$000(EventQueue.java:96)
	at java.awt.EventQueue$1.run(EventQueue.java:608)
	at java.awt.EventQueue$1.run(EventQueue.java:606)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
	at java.awt.EventQueue$2.run(EventQueue.java:622)
	at java.awt.EventQueue$2.run(EventQueue.java:620)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)