TOUCH_UP events not showing after multitouch

[AlxndrPsclt]

The following script should show all touch events related to the touchscreen:

from libinput import LibInput, ContextType, EventType
li = LibInput(context_type=ContextType.PATH)
device = li.add_device('/dev/input/event1')
for e in li.events:
    if e.type.is_touch():
        print([e.time, e.type])

Everything works fine when using single touch; we get a TOUCH_DOWN, followed by TOUCH_MOTION interlaced with some TOUCH_FRAME events, and finally a TOUCH_UP.

But when touching with two or more fingers, We get 2 TOUCH_DOWNS (slot 0 and 1), a stream of TOUCH_MOTIONS (slot 0 and 1), TOUCH_FRAME events but no TOUCH_UP.
Worse yet, using a single double finger gesture breaks single finger gestures: TOUCH_UP no longer show for single finger events after this, requirering that the script be restarded.

When checking with

libinput debug-events

everything works, the TOUCH_UP events appear everytime as expected.

[whot]

This appears to be a timeout issue, I can reproduce it but only if I release the fingers immediately after motion. If the fingers rest for even a short time after movement, I get the TOUCH_UP events correctly.

Not quite sure what timeout is involved here though, the only timeout we have in libinput is the one for touch arbitration but that doesn't apply here (and like you I cannot reproduce this with libinput debug-events anyway).

[AlxndrPsclt]

Ok, thanks for the feedback, I tried it again, but even leaving my fingers on the screen for some time (0.5s, 1s, 4s) after a double fingered gesture does not yield TOUCH_UP events.

Skimmed through the code of the bindings, and did not see any special case or dissimetry relating to TOUCH_UP. I have zero experience in creating python bindings for C, so I might miss a lot here.