Copying the delimiter property also.

Functions operating on a copy of lists must copy the delimiter also.

Author: delapuente

src/eval.cpp

@@ -461,7 +461,8 @@ namespace Sass {
                                l->pstate(),
                                l->length(),
                                l->separator(),
-                               l->is_arglist());
+                               l->is_arglist(),
+                               l->delimiter());
     for (size_t i = 0, L = l->length(); i < L; ++i) {
       ll->append((*l)[i]->perform(this));
     }

src/functions.cpp

@@ -1304,7 +1304,7 @@ namespace Sass {
       if (l->empty()) error("argument `$list` of `" + std::string(sig) + "` must not be empty", pstate);
       double index = std::floor(n->value() < 0 ? l->length() + n->value() : n->value() - 1);
       if (index < 0 || index > l->length() - 1) error("index out of bounds for `" + std::string(sig) + "`", pstate);
-      List_Ptr result = SASS_MEMORY_NEW(List, pstate, l->length(), l->separator());
+      List_Ptr result = SASS_MEMORY_NEW(List, pstate, l->length(), l->separator(), false, l->delimiter());
       for (size_t i = 0, L = l->length(); i < L; ++i) {
         result->append(((i == index) ? v : (*l)[i]));
       }