Inform the listeners that a change is about to take place using their firePreChangeEvent methods.
Listeners will be informed if they were interested in all types of event, or if ce.getType() is equal to the type they are registered for.
This method must be called while the current thread holds the lock on this change support.
@param ce the ChangeEvent to pass on @throws ChangeVetoException if any of the listeners veto this change
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