Please describe the problem:
Specifying button backgrounds to be drawn specifically for buttons on the left side and on the right side for pressed state is broken when using another button layout than "menu:minimize,maximize,close".

Steps to reproduce:
1. 
Install the following theme
http://www.update.uu.se/~ml/metacity-pos-theme-0.1.tar.gz
2. 
Select the theme, it's name is pOS
3. 
Change the button layout (using gconf-editor) to "close:minimize,maximize"
4.
Press the close button on a window (this button is now to the left). The right-most button is affected...


Actual results:
The button background drawing operation is applied to the wrong buttons.

Expected results:


Does this happen every time?
Yes

Other information:
For the various frame styles I have these specifications:

    <button function="left_middle_background" state="normal" draw_ops="button_bg_left"/>
    <button function="left_middle_background" state="pressed" draw_ops="button_bg_left_pressed"/>
    <button function="right_middle_background" state="normal" draw_ops="button_bg_right"/>
    <button function="right_middle_background" state="pressed" draw_ops="button_bg_right_pressed"/>

I also tried to specify tags for all functions (left_left, left_right, right_left, right_right), but it still is broken.