kstyle: fix misalignment of spinbox item sizes

kstyle/breezestyle.cpp

@@ -2368,6 +2368,11 @@ namespace Breeze
         // copy rect
         auto rect( option->rect );
 
+        if (subControl == SC_SpinBoxUp || subControl == SC_SpinBoxDown) {
+            // compensate for 1px margin + 1px border
+            rect.adjust( 2, 2, -2, -2 );
+        }
+
         switch( subControl )
         {
             case SC_SpinBoxFrame: return flat ? QRect():rect;
@@ -2375,14 +2380,16 @@ namespace Breeze
             case SC_SpinBoxUp:
             {
                 auto r = rect;
-                r.setLeft(r.width()-buttonSize);
+                r.setWidth(buttonSize);
+                r.moveRight(rect.right());
                 return r;
             }
 
             case SC_SpinBoxDown:
             {
                 auto r = rect;
-                r.setRight(buttonSize);
+                r.setWidth(buttonSize);
+                r.moveLeft(rect.left());
                 return r;
             }
 
@@ -6884,9 +6891,9 @@ namespace Breeze
 
         painter->setPen( _helper->separatorColor( palette ));
         if (subControl == SC_SpinBoxUp) {
-            painter->drawLine(QLine(arrowRect.topLeft()+QPoint(1, 4), arrowRect.bottomLeft()-QPoint(-1, 4)));
+            painter->drawLine(QLine(arrowRect.topLeft()+QPoint(0, 2), arrowRect.bottomLeft()-QPoint(0, 2)));
         } else {
-            painter->drawLine(QLine(arrowRect.topRight()+QPoint(0, 4), arrowRect.bottomRight()-QPoint(0, 4)));
+            painter->drawLine(QLine(arrowRect.topRight()+QPoint(0, 2), arrowRect.bottomRight()-QPoint(0, 2)));
         }
 
     }