backport the horizontal scrollbar fix in microblogging applet

svn path=/branches/KDE/4.3/kdelibs/; revision=1002240

widgets/scrollwidget.cpp

@@ -81,6 +81,9 @@ public:
             layout->addItem(horizontalScrollBar, 1, 0);
             horizontalScrollBar->show();
         }
+
+        layout->activate();
+        widget->resize(scrollingWidget->size().width(), widget->size().height());
     }
 
     void verticalScroll(int value)
@@ -217,8 +220,6 @@ void ScrollWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
         return;
     }
 
-    d->widget->resize(d->scrollingWidget->size());
-
     d->adjustScrollbars();
 
     d->adjustClipping();