Thanks for finding a reasonable fix to this problem. The root culprit is likely
that during two- and three-finger taps, many touchpad drivers lose track of
which finger is the tracking one. This results in sudden jumps of the
pointer, which due to the MaxTapMove logic cancels the tapping action. The
reasonable default otherwise is something like a finger wide, which is what the
new auto-set defaults will give you in the next upstream release. I will have a
look at the possibility to fix the tracking finger better, since this would
also remove the disturbing behavior of a moving pointer during multi-finger
actions.
On a different note, I have trouble seeing how
Option "MaxTapMove" "0"
can work, since it counteracts the idea behind MaxTapMove.
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Multi-finger tapping broken
https://bugs.launchpad.net/bugs/270002
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