edge proto attributes need root graph

diff --git a/tclpkg/gv/gv.cpp b/tclpkg/gv/gv.cpp
index 577c42466442da5b883c10666f348787c0dff653..1977b52d93ed3038da4e027f720bdaad960b2844 100644 (file)
--- a/tclpkg/gv/gv.cpp
+++ b/tclpkg/gv/gv.cpp
@@ -258,7 +258,7 @@ char *setv(Agedge_t *e, char *attr, char *val)
 
     if (!e || !attr || !val)
        return NULL;
-    g = e->tail->graph;
+    g = e->tail->graph->root;
     a = agfindattr(g->proto->e, attr);
     if (!a)
         a = agedgeattr(g, attr, empty_string);