Tom Whittock submitted this patch on the cgwin-xfree mail list:-
"Here follows a simple patch to the xwin program to enable multiple
monitor support for full screen operation using the gdi engine:
xwin -fullscreen -engine 1 -screen 0 @1 -screen 1 @2
what used to occur was that both screens would be opened one behind
the other on the primary monitor. They now open on the device selected
by the @component. Note that this does not mean Xinerama support is
available, so dragging windows between the screens is not possible
(unless I've missed something)"
I've build this into Xming but cannot fully test as I haven't a multiscreen rig.
The patch applies equally to the monolithic and modular trees.
Created attachment 5821 [details] [review]
merged to head, thanks!