I worked with visual studio 2005 and 4.1.4. Now I have installed 4.3.1 and works fine (I thought). I have 2 QDockWidget, one I want to be fixed (it's width) and the other no fixed when i resize the windows.
When I compile my project with 4.1.4 version works fine, but with this version the two QtDockwidget resize. My code is:

Qt Code: 
  1. glWidgetArea = new QScrollArea();
  2. glWidgetArea->setWidget(glWidget);
  3. glWidgetArea->setWidgetResizable(true);
  4. glWidgetArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  5. glWidgetArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  6. glWidgetArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
  7. glWidgetArea->setMinimumSize(100, 100);
  8.  
  9. QDockWidget *ogldock = new QDockWidget(parent);
  10. ogldock->setAllowedAreas(Qt::LeftDockWidgetArea);
  11. ogldock->setFeatures(QDockWidget::NoDockWidgetFeatures);
  12. ogldock->setWidget(glWidgetArea);   <- this resize
  13.  
  14. QDockWidget *gdock = new QDockWidget(parent);
  15. gdock->setAllowedAreas(Qt::RightDockWidgetArea);
  16. gdock->setFeatures(QDockWidget::NoDockWidgetFeatures);
  17. gdock->setFixedWidth(250);  <- this would be fixed, but it doesn't
  18. gdock->setWidget(toolBox);
To copy to clipboard, switch view to plain text mode 

I have prove this at the end of this code

Qt Code: 
  1. toolBox->setFixedWidth(250);
To copy to clipboard, switch view to plain text mode 

and toolBox inside gdock is fixed but the area around resize. ogldock and gdock area resize 50% for each.