Make the sizegrip into a square

kdecoration/breezedecoration.cpp

@@ -553,7 +553,7 @@ namespace Breeze
                 painter->setPen( c->color( ColorGroup::Active, ColorRole::TitleBar ) );
                 QPointF p=rect().bottomRight()+QPointF(0.5, 0.5);
                 // Unfortunately SizeGrip::GripSize is private
-                const int sizeGripSize = 18; //SizeGrip::GripSize;
+                const int sizeGripSize = 10; //SizeGrip::GripSize;
                 QPointF q=p-QPoint(0, sizeGripSize);
                 QPointF r=p-QPoint(sizeGripSize, 0);
                 painter->drawLine( p, q );

kdecoration/breezesizegrip.cpp

@@ -40,6 +40,7 @@ namespace Breeze
         // mask
         setMask( QRegion( QVector<QPoint>{
             QPoint( 0, GripSize ),
+            QPoint( 0, 0 ),
             QPoint( GripSize, 0 ),
             QPoint( GripSize, GripSize ),
             QPoint( 0, GripSize )} ) );
@@ -131,9 +132,10 @@ namespace Breeze
         painter.setPen( Qt::NoPen );
         painter.setBrush( backgroundColor );
 
-        // polygon
+        // polygon -- should really use a rectangle here
         painter.drawPolygon( QVector<QPoint> {
             QPoint( 0, GripSize ),
+            QPoint( 0, 0),
             QPoint( GripSize, 0 ),
             QPoint( GripSize, GripSize ),
             QPoint( 0, GripSize )} );

kdecoration/breezesizegrip.h

@@ -68,7 +68,7 @@ namespace Breeze
         //* grip size
         enum {
             Offset = 0,
-            GripSize = 18,
+            GripSize = 10,
         };
 
         //* decoration