fdo#37403: Fixed the SdrRectObj::operator = to avoid leaks

svx/source/svdraw/svdorect.cxx

@@ -124,8 +124,13 @@ SdrRectObj& SdrRectObj::operator=(const SdrRectObj& rCopy)
 
     SdrTextObj::operator=( rCopy );
 
+    if(mpXPoly)
+        delete mpXPoly;
+
     if ( rCopy.mpXPoly )
         mpXPoly = new XPolygon( *rCopy.mpXPoly );
+    else
+        mpXPoly = rCopy.mpXPoly;
 
     return *this;
 }