The border was not there in 3.10 and it is not
intended to be there in 3.14.
https://bugzilla.gnome.org/show_bug.cgi?id=740811
Gbp-Pq: Name 31_printers_border.patch
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="show_tabs">False</property>
+ <property name="show_border">False</property>
<child>
<object class="GtkButton" id="printer-model-button">
<property name="use_action_appearance">False</property>