if ((pan2 != pan) && PANELS_OVERLAPPED(pan,pan2)) {\
int y, ix1, ix2, iy1, iy2;\
COMPUTE_INTERSECTION(pan, pan2, ix1, ix2, iy1, iy2);\
if ((pan2 != pan) && PANELS_OVERLAPPED(pan,pan2)) {\
int y, ix1, ix2, iy1, iy2;\
COMPUTE_INTERSECTION(pan, pan2, ix1, ix2, iy1, iy2);\