Line weight UI not updated on load

[GoogleCodeExporter]

In preferences, I've set the default line weight to be 2.
When I open a nwk file, this value is respected: the line weights on the tree 
are 2.
However, in the Appearance menu, on the left-hand-side, the text box for line 
weight has a 1.

Original issue reported on code.google.com by [email protected] on 13 Sep 2014 at 9:06