Updated version of the following OpenSuse patch:

Author: Luboš Luňák <l.lunak@suse.cz>
Date:   Thu Oct 20 19:05:13 2011 +0200

    fix horizontal scrollbars with KDE oxygen style (bnc#722918)
    
    Apparently there are two style flags for detecting the widget
    is horizontal.

--- vcl/unx/kde4/KDESalGraphics.cxx.orig	2011-05-20 18:06:22.000000000 +0200
+++ vcl/unx/kde4/KDESalGraphics.cxx	2011-11-24 22:28:12.471919042 +0100
@@ -493,10 +493,9 @@
             if (sbVal->mnVisibleSize < sbVal->mnMax)
                 option.state = QStyle::State_MouseOver;
             
-            //horizontal or vertical
-            if (part == PART_DRAW_BACKGROUND_VERT)
-                option.orientation = Qt::Vertical;
-            else
+            bool horizontal = ( part == PART_DRAW_BACKGROUND_HORZ ); //horizontal or vertical
+            option.orientation = horizontal ? Qt::Horizontal : Qt::Vertical;
+            if( horizontal )
                 option.state |= QStyle::State_Horizontal;
             
             //setup parameters from the OO values
@@ -592,7 +591,10 @@
         option.maximum     = slVal->mnMax;
         option.minimum     = slVal->mnMin;
         option.sliderPosition = option.sliderValue = slVal->mnCur;
-        option.orientation = (part == PART_TRACK_HORZ_AREA) ? Qt::Horizontal : Qt::Vertical;
+        bool horizontal = ( part == PART_TRACK_HORZ_AREA ); //horizontal or vertical
+        option.orientation = horizontal ? Qt::Horizontal : Qt::Vertical;
+        if( horizontal )
+            option.state |= QStyle::State_Horizontal;
         
         draw( QStyle::CC_Slider, &option, m_image, vclStateValue2StateFlag(nControlState, value) );
     }
@@ -903,7 +905,10 @@
                 QStyleOptionSlider option;
                 OSL_ASSERT( val.getType() == CTRL_SCROLLBAR );
                 const ScrollbarValue* sbVal = static_cast<const ScrollbarValue *>(&val);
-                option.orientation = ( part == PART_TRACK_HORZ_AREA ) ? Qt::Horizontal : Qt::Vertical;
+                bool horizontal = ( part == PART_TRACK_HORZ_AREA ); //horizontal or vertical
+                option.orientation = horizontal ? Qt::Horizontal : Qt::Vertical;
+                if( horizontal )
+                    option.state |= QStyle::State_Horizontal;
                 option.minimum = sbVal->mnMin;
                 option.maximum = sbVal->mnMax;
                 option.sliderValue = sbVal->mnCur;
@@ -971,6 +976,8 @@
         rect.moveTo( 0, 0 );
         QStyleOptionSlider options;
         options.orientation = bHorizontal ? Qt::Horizontal : Qt::Vertical;
+        if( bHorizontal )
+            options.state |= QStyle::State_Horizontal;
         options.rect = rect;
         // some random sensible values, since we call this code only for scrollbar buttons,
         // the slider position does not exactly matter