touchpad: add a note to the synaptics touch restore feature
We have code in place to handle the quirky transition from two to three fingers (where one slot ends and another one starts). We do not handle the same issue when transitioning from three to two fingers. This is a note only because it hasn't mattered so far, at least until eb6ef9fe from #408. And it doesn't matter anymore now either because that code is now only called for ALPS devices. libinput/libinput#434 (comment 419912) Signed-off-by:Peter Hutterer <peter.hutterer@who-t.net>
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