[graph-tool] problem with graphviz_draw()

[Rolf Sander]

Hello,

After updating graph_tool from version 2.33 to 2.35, I cannot make plots
with graphviz_draw() anymore. Here is a minimal example to reproduce the
error:

#################################
import graph_tool.all as gt
g = gt.Graph()
v0 = g.add_vertex()
v1 = g.add_vertex()
e01 = g.add_edge(v0,v1)
g_dict = {'layout':'neato'}
gt.graphviz_draw(g, gprops=g_dict)
#################################

The error message is:

#################################
Error: Layout type: "n" not recognized. Use one of: circo dot fdp neato
        nop nop1 nop2 osage patchwork sfdp twopi
Error: Layout was not done
Segmentation fault
#################################

I suspect that somewhere the string 'neato' is converted to a single
character 'n'. In my real code, I also get several warning messages
quoting only the first character of miscellaneous strings.

I have python3-graph-tool installed on my computer which runs on Linux
Mint 19.2 Tina (based on Ubuntu 18.04 LTS, bionic). My graphviz version
is 2.40.1.

Can anyone reproduce this?

Best regards
Rolf

-- 
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   Rolf Sander                              phone: [+49] 6131/305-4610
   Max-Planck Institute of Chemistry        email: rolf.sander at mpic.de
   PO Box 3060, 55020 Mainz, Germany     homepage: www.rolf-sander.net
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