Description of problem:
Top bar popup menus are misplaced on multihead configurations.


Version-Release number of selected component (if applicable):
(the one shipped with Fedora 15 Alpha x86_64 live cd -- sorry for being vague :-( )

How reproducible:
Always

Steps to Reproduce:
1.login to dekstop on a dual-head configuration
2.rearrange monitors on display configuration settings so that secondary monitor is placed to the left of primary monitor (default is place it to the right)
3.click on any link on the top bar
  
Actual results:
Poupup menus appear on the wrong place. It's as if GNOME still thinks the monitor to the left (secondary) is still the primary, and considers its top-left corner as origin (0, 0).

Expected results:
Menus should appear on the right places.

Additional info:
I have two different monitors, using different resolutions (1280x1024 on the secondary and 1680x1050 on the primary). Graphics card is a GeForce 9800 GT.