https://bugs.kde.org/show_bug.cgi?id=510993

--- Comment #1 from [email protected] ---
I'm not able to make this happen on any of my devices. It might be possible to
figure out more by adding logging in the touch handling to figure that out,
similar to the tablet event log. That might take a while though, since there's
currently still pending changes to that part of the code.

It may be possible to figure this out quicker through Drawpile, since that uses
the same underlying technology as Krita and already has that logging. If you'd
be willing to try that out:

* Grab the latest version of Drawpile, at the time of writing that is
2.3.0-beta.4 (NOT 2.2.2, that doesn't use quite the same touch handling as
Krita): https://drawpile.net/download/#Beta
* Create a new canvas and briefly familiarize yourself with the touch gestures
and check whether they work. You can see which gestures are available and what
they're supposed to do under Edit → Preferences → Touch.
* In the top menu open Help → Touch Tester, touch around on the area on the
left. Ideally, make a screen recording of this with touch feedback enabled,
that way I can see what you're doing and what the program is seeing
simultaneously. Stop the screen recording and close the touch tester, attach
the recording to this bug or upload it somewhere else so that I can analyze it.
* Again in the top menu, use Tools → Developer Tools → Tablet Event Log and
pick a file somewhere you can find it again. Make the following touch inputs on
the canvas. Please only do each one once and in this order so that I can
correlate them easier. A screen recording of this would also be helpful, but is
not strictly necessary if you follow the order exactly:
    1. One finger tap.
    2. Two-finger tap.
    3. Three-finger tap.
    4. Four-finger tap.
    5. One-finger drag.
    6. Two-finger drag and twist.
    7. One finger tap and hold.
Then in the top menu use Tools → Developer Tools → Stop Tablet Event Log to
finish the log. This is important, otherwise the log will be incomplete! Then
close Drawpile and attach the log file and potential screen recording to this
bug or upload it somewhere else.

If you don't want to do that, I'll also write here again once the logging has
made its way into Krita.

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