added splitter width to metrics

kstyle/breeze.h

@@ -160,6 +160,9 @@ namespace Breeze
         ItemView_ArrowSize = 10,
         ItemView_ItemMarginWidth = 4,
 
+        // splitter
+        Splitter_SplitterWidth = 1,
+
         // shadow
         Shadow_Size = 10,
         Shadow_Overlap = 4

kstyle/breezestyle.cpp

@@ -463,8 +463,10 @@ namespace Breeze
             // dock widget
             // return 0 here, since frame is handled directly in polish
             case PM_DockWidgetFrameWidth: return 0;
-            case PM_DockWidgetTitleMargin: return Frame_FrameWidth;
-            case PM_DockWidgetTitleBarButtonMargin: return ToolButton_MarginWidth;
+            case PM_DockWidgetTitleMargin: return Metrics::Frame_FrameWidth;
+            case PM_DockWidgetTitleBarButtonMargin: return Metrics::ToolButton_MarginWidth;
+
+            case PM_SplitterWidth: return Metrics::Splitter_SplitterWidth;
 
             // fallback
             default: return ParentStyleClass::pixelMetric( metric, option, widget );