I've reviewed the PPA fix, which contains a fix both for this bug and
for 282735.  The fix for this bug is:

+     touch = finger && !priv->finger_state;
+     release = !finger && priv->finger_state;
+-    move = (((abs(hw->x - priv->touch_on.x) >= para->tap_move) ||
++    move = ((priv->tap_max_fingers <= ((priv->horiz_scroll_twofinger_on || 
priv->vert_scroll_twofinger_on)? 2 : 1)) &&
++           ((abs(hw->x - priv->touch_on.x) >= para->tap_move) ||
+            (abs(hw->y - priv->touch_on.y) >= para->tap_move)));
+

>From a risk standpoint, this looks quite safe, with all risk localized
to touchpad behavior, so I'm comfortable with it.  Also, given the
confirmation in comment #15, it sounds ready for upload.

-- 
Multi-finger tapping broken
https://bugs.launchpad.net/bugs/270002
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