Qt: SeekStyle: don't use outer size for inner content (fix #9740)

modules/gui/qt4/styles/seekstyle.cpp

@@ -42,8 +42,8 @@ int SeekStyle::pixelMetric( PixelMetric metric, const QStyleOption *option, cons
 {
     const QStyleOptionSlider *slider;
 
-    if ( metric == PM_SliderLength && ( slider = qstyleoption_cast<const QStyleOptionSlider *>( option ) ) )
-        return slider->rect.height();
+    if ( widget && metric == QStyle::PM_SliderThickness && ( slider = qstyleoption_cast<const QStyleOptionSlider *>( option ) ) )
+        return widget->minimumSize().height();
     else
         return QProxyStyle::pixelMetric( metric, option, widget );
 }

modules/gui/qt4/util/input_slider.cpp

@@ -112,6 +112,7 @@ SeekSlider::SeekSlider( Qt::Orientation q, QWidget *_parent, bool _static )
     setFocusPolicy( Qt::NoFocus );
 
     /* Use the new/classic style */
+    setMinimumHeight( 18 );
     if( !b_classic )
     {
         alternativeStyle = new SeekStyle;