From Tatsuhiro Nishioka, "I found a bug in GraphicsWindowCarbon.

GraphicsWindowCarbon::requestWarpPointer() places the mouse pointer in a (global?) display coordination, but it must be in a local window coordination. This problem is critical because the mouse cursor can go off a window especially when you place the window on the secondary screen.

Attached is the file to fix this problem.

I tested this modified file with the following situations (on FlightGear) and all works fine.
- two windows on two screens (each has one window).
- two windows on two screens (secondary screen has all windows).
- two windows on two screens (primary screen has all windows).

In all scenarios, warp requests (by right-click the mouse) successfully moves the mouse pointer to the center of the main window,
and it is what it's supposed to be in the flightgear."

src/osgViewer/GraphicsWindowCarbon.cpp

@@ -1271,8 +1271,8 @@ void GraphicsWindowCarbon::requestWarpPointer(float x,float y)
     CGDirectDisplayID displayId = wsi->getDisplayID((*_traits));
 
     CGPoint point;
-    point.x = x;
-    point.y = y;
+    point.x = x + _traits->x;
+    point.y = y + _traits->y;
     CGDisplayMoveCursorToPoint(displayId, point);
 
     getEventQueue()->mouseWarped(x,y);