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windows/x11drv/event.c

It would be interesting to trace what is happening here, since
this is the point (I think) where the window for which the
event happened (what you see with the 'Got event' trace)
and the 'scope' window, that is, the topmost parent, and
the window coordinates.

You could add traces in this routine to display what are the
values 'in' and 'out' for hwnd and x,y. Then compare what
is happening in both cases (mouse and touchscreen)

Do you need help in adding traces ? C is not that different
from Pascal :-)

Gerard