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In config files whose type is XML, it is very common to have elements whose value is a fully qualified java class name, for eaxmple, in faces-config.xml you have <system-event-listener-class>. There are MANY other examples. It would be really nice if code completion of class names worked here.
How easy/difficult would that be to implement Denis?
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss