Broken visuals in network graph

Created by: veprbl

Here is how branch tags looked in v2.5.0: http://rghost.net/38754775/image.png Here is how they look at HEAD: http://rghost.net/38754778/image.png

I have this regression tested in Firefox 13.0 and Opera 11.64

Also I spent some time git bisect'ing the problem and found out that first bad commit is 865cf830