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Call it only for the fileobject currently opened in the editor.
Fixed, Radku please verify. Thanks. http://hg.netbeans.org/web-main/rev/74d5dd42c7e6
Integrated into 'main-golden', will be available in build *201003250201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/74d5dd42c7e6 User: Tomas Mysik <tmysik@netbeans.org> Log: #182663: EditorExtender is too expensive