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In Project Properties I switched "Pre-Build First" check box ON. Then I invoked "Clean & Build". Surprisingly, after the build was over, there were no "Configure Code Assistance" button to the left of the build output pane!
fixed, change set: https://hg.netbeans.org/cnd-main/rev/a97e84a1da17
Integrated into 'main-silver', will be available in build *201606220002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/a97e84a1da17 User: Alexander Simon <alexvsimon@netbeans.org> Log: fixed Bug #262493 "Configure - Clean - Build" does not have "Configure Code Assistance" button