[kde] [Bug 433378] New: KDE libinput do not use TOUCH_CANCEL event

[giotherobot]

https://bugs.kde.org/show_bug.cgi?id=433378

            Bug ID: 433378
           Summary: KDE libinput do not use TOUCH_CANCEL event
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: giotherobot at gmail.com
  Target Milestone: ---

SUMMARY

I use a laptop (Dell Inspiron 14 2in1) that has a tocuhcreen with active pen. I
have KDE Neon. While debugging a problem in touchegg
(https://github.com/JoseExposito/touchegg/issues/458) I stumbled upon the
possible reason for this bug: when I touch the screen and then use the pen i
get "ghost tocuhes" that makes the use of the touchscreen impossible until I
disable and re-enable the corresponding input device with xinput.

STEPS TO REPRODUCE
1. Touch the screen with one finger.
2. USe the pen on the screen (even just close enouch to trigger proximity)
3. Take the finger off the screen, now there is a ghost touch and the cursor
will not follow your touch anymore

ADDITIONAL INFO

The debugging of touchegg led me to use libinput debug-events to monitor
libinput since there is no native gesture support. This gets me to believe that
KDE for some reason do not use the (correctly reported) TOUCH_CANCEL event that
occur after the pen gets in proximity of the panel.
I tried installing gnome-shell to see if the problem is not on KDE but on X and
in gnome it seems to work correctly.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon
(available in About System)
KDE Plasma Version: 5.21.0
KDE Frameworks Version: 7.79.0
Qt Version: 5.15.2

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