We have to use setFixedSize() here, otherwise the layout will set a height

of 0 for the ThumbnailWidget => ThumbnailWidget::region() is empty => QWidget::repaint
won't paint the content of the widget.

Now the thumbnails are showed on startup again and when the orientation is
changed the layout of the thumbnails is adapted as well...

svn path=/trunk/playground/graphics/okular/; revision=578852

ui/thumbnaillist.cpp

@@ -510,7 +510,7 @@ void ThumbnailWidget::resizeFitWidth( int width )
 {
     m_pixmapWidth = width - m_margin;
     m_pixmapHeight = (int)round( m_page->ratio() * (double)m_pixmapWidth );
-    resize( width, heightHint() );
+    setFixedSize( QSize( width, heightHint() ) );
 }
 
 void ThumbnailWidget::setSelected( bool selected )