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Description of problem:
When clicking "License" button on virt-manager's about dialog, shows error: 
g_object_set_valist: object class `GtkTextTag' has no property named `font-scale' in types.py


Version-Release number of selected component:
virt-manager-0.10.0-18.el7.noarch

How reproducible:
100%

Steps to Reproduce:
1. Start virt-manager with --debug
#virt-manager --debug

2. Select "Help" -> "About", and click "License" button



Actual result:
Following error displays:
-------------------------------------------------------------
2014-03-19 14:13:04,657 (about:36): Showing about
/usr/lib64/python2.7/site-packages/gi/types.py:113: Warning: g_object_set_valist: object class `GtkTextTag' has no property named `font-scale'
  return info.invoke(*args, **kwargs)

(virt-manager:6311): Gtk-CRITICAL **: gtk_text_buffer_apply_tag: assertion `tag->priv->table == buffer->priv->tag_table' failed
-------------------------------------------------------------

Expected results:
No error or warning should be displayed.


Additional info:
1. This issue does not occur on RHEL6

it seems a problem in the gtk+ widget.  I've found this in the upstream tracker:

https://bugzilla.gnome.org/show_bug.cgi?id=701119

Moving to gtk for further probing.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2116.html