Cherry-pick of 2geom update (re. 1488); prevent crash during Path->Piecewise conversi...

diff --git a/src/2geom/path.h b/src/2geom/path.h
index 1c142f98d542e42d74d2a9fc079df629136af09b..1e9aa1d42cbd805c2daf94340beb84d239869b49 100644 (file)
--- a/src/2geom/path.h
+++ b/src/2geom/path.h
@@ -270,12 +270,19 @@ public:
     Piecewise<D2<SBasis> > ret;
     ret.push_cut(0);
     unsigned i = 1;
+    bool degenerate = true;
     // pw<d2<>> is always open. so if path is closed, add closing segment as well to pwd2.
     for(const_iterator it = begin(); it != end_default(); ++it) {
       if (!it->isDegenerate()) {
         ret.push(it->toSBasis(), i++);
+        degenerate = false;
       }
     }
+    if (degenerate) {
+      // if path only contains degenerate curves, no second cut is added
+      // so we need to create at least one segment manually
+      ret = Piecewise<D2<SBasis> >(initialPoint());
+    }
     return ret;
   }