I should have read the manpage for quartz-wm carefully!  quartz-wm have the option --only-proxy, which make it act as a bridge between the pasteboard and X server clipboard, without getting in the way of managing the display.
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adding: &quot;quartz-wm --only-proxy &amp;&quot; to my .xinitrc solve the problem.<br>
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Happy XMonad!<br>
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