Make the button not grow too big, and ensure that the actionbar
has a background.
https://bugzilla.gnome.org/show_bug.cgi?id=761792
<object class="GtkActionBar" id="actionbar">
<property name="visible">1</property>
<property name="hexpand">1</property>
+ <style>
+ <class name="background"/>
+ </style>
<child>
<object class="GtkLabel">
<property name="visible">1</property>
<property name="can_focus">1</property>
<property name="sensitive">0</property>
<property name="receives_default">1</property>
+ <property name="valign">center</property>
<signal name="clicked" handler="on_connect_button_clicked" object="GtkPlacesView" swapped="yes"/>
</object>
<packing>