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  1. Qt
  2. QTBUG-3492

It would be nice to have a signal indexAboutToBeChanged() in QTabBar before current index changes

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      It would be nice to have QTabBar (and eventually) QTabWidget emit a signal indexAboutToBeChanged() before the current index changes,
      This will enable users to do some preparatory work before next tab widget page becomes visible.

      Alternately making the setCurrentIndex() virtual would also serve the purpose.

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