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On OSX, Cmd-click is supposed to be the same as middle-click. However, Sammy is not propagating events for cmd-clicks, though it does it correctly for middle-clicks. I asked about this on StackOverflow and the discussion is useful: http://stackoverflow.com/questions/10660360/command-click-doesnt-open-a-new-tab-but-middle-click-does/
make sure cmd-click still works as expected on a mac; fixes #144
Thanks pbiggar and o.v..