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Now it is unusable for a big number of keys in a bundle. It should have something like fast find too: If I write CTL_ in the combobox it should scroll to first CTL_ key in the list.
This is not a bug as it does not conflict with the user's view specification (see http://i18n.netbeans.org/doc/UserView32.html, section "I18N Dialog Components"). It is an enhancement which requires a UI changes - it is too late for implementation and integration to NetBeans 3.6.