From https://bugzilla.redhat.com/show_bug.cgi?id=1256045 Finger order: first finger down second finger down first finger up second finger held down This generates a right-click tap event. In the original bug report the main issue is that this interferes with scroll events. Even without that, a tap with a finger held down should generate a left-click event, not a right click event. Possible solution is adding another timeout state to the current transition from TAP_2 so that the right button event is only generated when the second finger is also released within the timeout. Otherwise, we can move to the multitap states or swallow the button event altogether. Notably, this also requires us to keep track of which finger was released, since putting first finger down, tapping with the second finger and then keeping the first finger down is a definitive tap.
commit 79570fd492691b4ce97360e7775965e5765a702b Author: Peter Hutterer <peter.hutterer@who-t.net> Date: Mon Aug 31 11:10:58 2015 +1000 touchpad: don't tap for 2fg down, followed by a single finger up
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