added proper margin around toolbox tabs

kstyle/breeze.h

@@ -146,6 +146,7 @@ namespace Breeze
         // toolbox
         ToolBox_TabMinWidth = 80,
         ToolBox_TabItemSpacing = 4,
+        ToolBox_TabMarginWidth = 8,
 
         // tooltips
         ToolTip_FrameWidth = 3,

kstyle/breezestyle.cpp

@@ -1899,6 +1899,7 @@ namespace Breeze
 
         }
 
+        contentsWidth += 2*Metrics::ToolBox_TabMarginWidth;
         contentsWidth = qMin( contentsWidth, rect.width() );
         contentsWidth = qMax( contentsWidth, int(Metrics::ToolBox_TabMinWidth) );
         return centerRect( rect, contentsWidth, rect.height() );