Please describe the problem:
In a single-monitor system GNOME panels can be attached to any edge of the screen (left, top, right or bottom). As long as an edge-attached panel is not auto-hide, its maximized windows do not overlap it.


In a multi-monitor system setup with GNOME 2.26.1 and Ubuntu Jaunty, panels attach to the edges of individual monitors.
When a panel is attached to an edge of one monitor, which borders the opposite edge of another monitor, that panel is not excluded from the maximized area of windows maximized on the same screen.

The attached screenshots should make this problem very clear. There are two different screenshots - one with a secondary monitor below the primary and one with the secondary monitor to the right of the primary.

In both examples there are panels attached to each edge of both monitors (8 total panels). There is also one maximized window on each monitor (2 maximized windows). The problematic panels overlap the maximized windows and are highlighted in red in both screenshots.

Steps to reproduce:
1. enter multi-monitor setup with a secondary monitor BELOW the primary monitor
2. make sure you have a panel attached to the bottom edge of the PRIMARY monitor
3. open a GNOME Terminal (or any other) window 
4. maximize the opened window on the PRIMARY display

the same would happen if the secondary window was to the right/top/left and the panel was on the right/top/left edge


Actual results:
maximized window is obscured by the bottom panel

Expected results:
maximized window should be smaller so that it borders the bottom panel, but does not overlap it.

Does this happen every time?
yes, every single time, with both Metacity and Compiz

Other information:
i will attach 2 screenshots demonstrating the problem