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Returns the next patch. patch_polygon_handle could also be a regular polygon
that is not a patch, in this case the function will return the first patch
which is attached to this polygon or NULL if there aren't any patches attached.
Example:
Here is how to go through all the patches of a given polygon
for(DWORD poly=STATE_polygon_get_first_patch(polygon_handle); poly!=NULL; poly=STATE_polygon_get_next_patch(poly) )
{
do some processing for each patch
}
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