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Implement touchpad pinch (and rotate) gesture support. Note that two two-finger scrolling tests are slightly tweaked to assure that there is enough touch movement to allow the scroll-or-pinch detect code to do its work. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Jason Gerecke <jason.gerecke@wacom.com>
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