[Okular-devel] [okular] [Bug 354248] New: Freehand annotation confuses tablet and touch events

[Oliver Sander via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354248

            Bug ID: 354248
           Summary: Freehand annotation confuses tablet and touch events
           Product: okular
           Version: 0.23.60
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: oliver.sander at tu-dresden.de

I am using the freehand annotation tool on a Thinkpad Yoga, which comes with a
touch screen and a stylus.  These are separate input devices, and Qt is able to
distinguish between them.  I can draw with the stylus, but here is the problem:
1) Open the freehand annotation tool
2) Start drawing with the stylus
3) While still drawing, tap the screen with your finger somewhere else.
Result: At the moment of tapping, a spurious line appears (and stays!) which
connects stylus and finger.
Unfortunately, this situation is not nearly as obscure as it sounds:  When
writing with the stylus, you will frequently want to rest your palm on the
screen.  The palm then acts like the finger tap, and you get lots of artefacts
between palm and stylus tip.

Reproducible: Always

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