File mask_bbox.patch of Package hugin

--- a/src/hugin_base/panodata/Mask.cpp	Wed Jun 27 17:36:22 2018 +0200
+++ b/src/hugin_base/panodata/Mask.cpp	Sat Jun 30 00:26:40 2018 +0200
@@ -616,6 +618,7 @@
             };
         };
     };
+    calcBoundingBox();
     return m_polygon.size()>2;
 };