[Qt-interest] QScrollArea::resize() does not resize the viewport

[Nikos Chantziaras]

Calling resize() or setGeometry() on a QScrollArea results in the 
viewport() dimensions not being updated:

   void foo( QScrollArea* scr )
   {
       scr->resize(500, 500);
       do_some_stuff(scr->viewport()->size());
   }

do_some_stuff() receives a wrong size.  Is this normal?  For the code to 
work correctly, I need to do:


   void foo( QScrollArea* scr )
   {
       scr->viewport()->resize(500, 500);  // <-- Smells funny
       do_some_stuff(scr->viewport()->size());
   }

Why is that?  When the QScrollArea is resized with the mouse, the 
viewport changes accordingly.  When it's resized by code (like above), 
the viewport doesn't change.