Elantech touchpad: Palm rejection on three finger tap
libinput version: 1.11.0 on Arch Linux (also briefly tested with latest git version)
Laptop model: ASUS N550LF
Single-finger and two-finger taps work fine. Three finger taps only work if I tap with the very tips of my fingers, to reduce the touch area. If I do a normal three finger tap, pressure-based palm rejection seems to kick in, preventing it from working.
libinput measure touchpad-pressure output for a single, two and three-finger tap is included, although the tool claims it can't handle multiple fingers.
libinput debug-events for a three-finger tap: libinput debug-events --device /dev/input/event14 --verbose
touchpad-edge-detector values match the actual touchpad
The touchpad is a clickpad. The clickpad's software button functionality all works as expected. The problem only relates to tap-to-click.