Scroll with two fingers. While still scrolling, touch third finger to touchpad. Scrolling continues.... arguably, it should not.
commit ee99d4f7bc3374e8bac083ac4ea159f5da43db06 Author: Daniel Kurtz <djkurtz@google.com> Date: Mon Feb 14 22:08:41 2011 +0800 Stop scrolling if not exactly two fingers on touchpad.
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