The graphics output driver for XeLaTeX (file xetex.def) doesn't include clipping support. Martin Scharrer has added clipping to xetex.def. You can find his patch for xetex.def here:
https://groups.google.com/forum/#!msg/comp.text.tex/pOR3Zv39TUA/02hiqt8TP94J Also a modified version of xetex.def with clipping support is available here: https://bitbucket.org/martin_scharrer/adjustbox/src/46645f89378b/xetex/xetex.def Could you please consider this and if it is good enough, update xetex.def to support clipping? Thanks
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