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In all NetBeans for C++ installations I have seen, integration w/QT framework works flawlessly, except for the fact that documentation doesn't show up with auto-completion (or invoking help on a member name), like javadocs show up when coding Java. It should be very convenient to have that QT documentation in place out-of-the-box.
Do you have path to QT man in MANPATH? Does command: #man QFile show documentation?
Integrated into 'main-golden', will be available in build *201302060843* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/7b3c4384ce67 User: Alexander Simon <alexvsimon@netbeans.org> Log: fixed Bug #225759 QT projects don't have pop-up documentation for widget members upon CTRL+space-ing