Opensuse 13.1 and Gnome 3: remove title bar from maximised windows

This is the original theme file from a clean opensuse 13.1 - Gnome installation: /usr/share/themes/Adwaita/metacity-1/metacity-theme-3.xml

<frame_geometry name="max" title_scale="medium" parent="normal" rounded_top_left="false" rounded_top_right="false">
        <distance name="left_width" value="0" />
        <distance name="right_width" value="0" />
        <distance name="title_vertical_pad" value="15"/> <!-- 
                                                        This needs to be 1 less then the
                                                        title_vertical_pad on normal state
                                                        or you'll have bigger buttons                                                           -->
        <border name="title_border" left="10" right="10" top="1" bottom="2"/>
        <border name="button_border" left="0" right="0" top="0" bottom="0"/>
        <distance name="bottom_height" value="0" />
</frame_geometry>

My Dell has a 13.3" screen

So, to get back this useless area, set has_title="false" and remove that 15 from title_vertical_pad

<frame_geometry name="max" title_scale="medium" parent="normal" rounded_top_left="false" rounded_top_right="false" has_title="false">
        <distance name="left_width" value="0" />
        <distance name="right_width" value="0" />
        <distance name="title_vertical_pad" value="0"/>
        <border name="title_border" left="10" right="10" top="1" bottom="2"/>
        <border name="button_border" left="0" right="0" top="0" bottom="0"/>
        <distance name="bottom_height" value="0" />
</frame_geometry>

To apply this changes, run the command r: Alt-F2 and then r