_NET_WORKAREA reports a single rectangle as intersected work areas of
all monitors. So work areas on non-primary monitors may be incorrect.
For example, a dock only shown on the primary monitor reduces the work
areas on non-primary monitors.

There were attempts to extend _NET_WORKAREA to support work areas of
multiple monitors but they were rejected as EWMH is no longer being
maintained and _GTK_WORKAREAS was introduced instead.

Fix Office 2010 missing title bar on non-primary monitors on GNOME.
Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>