We recently started to respect border-width on the action_area
again, so set its border-width to 0 so it doesn't get in the way.
https://bugzilla.gnome.org/show_bug.cgi?id=722211
<property name="spacing">0</property>
<child internal-child="action_area">
<object class="GtkButtonBox" id="dialog-action_area1">
- <property name="border_width">6</property>
+ <property name="border_width">0</property>
<property name="can_focus">False</property>
<property name="layout_style">end</property>
<child>