From 58cc8b08a7901984cddf538bd8ed23d5d9917672 Mon Sep 17 00:00:00 2001
From: Tiago de Paula Peixoto <tiago@skewed.de>
Date: Wed, 16 Sep 2020 14:05:27 +0200
Subject: [PATCH] draw_hierarchy(): fix problem with undirected graphs

---
 src/graph_tool/draw/cairo_draw.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/graph_tool/draw/cairo_draw.py b/src/graph_tool/draw/cairo_draw.py
index 41c6fb4f..eec214c2 100644
--- a/src/graph_tool/draw/cairo_draw.py
+++ b/src/graph_tool/draw/cairo_draw.py
@@ -2006,7 +2006,7 @@ def draw_hierarchy(state, pos=None, layout="radial", beta=0.8, node_weight=None,
                       t.new_ep(eorder.value_type(),
                                eorder.fa.max() + 1)))
 
-    u, props = graph_union(g, t, props=props)
+    u, props = graph_union(GraphView(g, directed=True), t, props=props)
 
     for k in set(list(vprops.keys()) + list(hvprops.keys())):
         t_vprops[k] = props.pop(0)
-- 
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