https://bugs.documentfoundation.org/show_bug.cgi?id=145816

Michael Weghorn <[email protected]> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #10 from Michael Weghorn <[email protected]> ---
(In reply to Sulphur from comment #7)
> A bit more information: my original description of the bug appearing only on
> HiDPI screen was incorrect: all that matters is that the system's scaling is
> set to 200% or more.

Thanks for the additional testing and information!
Indeed, I could reproduce this now with QT_SCALE_FACTOR=2.0 set and the
attached sample doc. It happens very rarely for me, though, usually takes me
about 30-60 seconds of clicking around to trigger the issue. The "additional"
cursor disappears when a repaint is triggered, e.g. by scrolling a bit.

(In reply to Sulphur from comment #9)
> The bug seems to have been introduced in the 7 series of LibreOffice. It
> does not occur in the 6.4 series of LibreOffice (6.4.7 tested). In the first
> stable version of the 7 series (7.0.0.1) it is present.
> 
> I have also tested this in the newest daily build (dev
> 7.5.0.0.alpha0_2022-09-04); the bug is still present.
> 
> I could not, however, reproduce the issue in Gnome (tested in Ubuntu
> 22.04.1), only in KDE (tested in Kubuntu 22.04.1, the newest dev build of
> KDE Neon, as well as current stable Manjaro). Is it possible that it is an
> issue with KDE? I'm not a programmer, so I'm not sure, but since the
> LibreOffice 6 series does not have the bug in even the newest versions of
> the Plasma Desktop (5.25, recently released), while the LibreOffice 7 series
> always does, some change to LibreOffice seems to have triggered it.

This sounds like this might be specific to the so-called "kf5" VCL plugin,
which is selected by default when in a Plasma session, but not GNOME. The "kf5"
VCL plugin did not exist in older LO versions.

Can you double-check whether the issue is gone when you start LO with the
environment variable SAL_USE_VCLPLUGIN=gtk3 set (and double-check that "Help"
-> "About LibreOffice" now displays "VCL: gtk3" instead of "VCL: kf5 ..."?



Version: 7.5.0.0.alpha0+ / LibreOffice Community
Build ID: c317f0adb308b1ece3bfa8bdffb4d0bcb1478d30
CPU threads: 12; OS: Linux 5.19; UI render: default; VCL: kf5 (cairo+xcb)
Locale: en-GB (en_GB.UTF-8); UI: en-US
Calc: threaded

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