watching the content of the evemu-record, the only different between
double-tap on the touchpad and double-click on the mouse buttons below
the touchpad i saw, is the timing.

double-tap is way faster than the double-click.

double-tap: 6ms..11ms between tap-release
double-click: 79ms..137ms between click-release

going back to ubuntu 18.04 daily-live is made sligktly slower double-tap
on the touchpad with the result, that some of the slower double-taps
were recognized as double-click.

is there somewhere a kind of "debouncing"-algorithm that let the double-
tap recognized as "bouncing" and is filtered out - so it is only seen as
single-click... ?

** Attachment added: "evemu-record of the device"

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  double tap on touchpad isn't recognized as double click on ubuntu
  18.04 bionic

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