https://bugs.kde.org/show_bug.cgi?id=399349

            Bug ID: 399349
           Summary: destructive square created on layer rarely when using
                    sliders
           Product: krita
           Version: 4.1.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Instant Preview
          Assignee: krita-bugs-n...@kde.org
          Reporter: b...@fastmail.com
  Target Milestone: ---

Created attachment 115393
  --> https://bugs.kde.org/attachment.cgi?id=115393&action=edit
video of square behaviour with HSV slider

SUMMARY
A "random" square appears rarely when using various sliders. This has happened
for many versions (>= 4), but is hard to reproduce.

STEPS TO REPRODUCE
Reproducible: Rarely

Unknown exact steps prior, however it has always been when using sliders,
mostly HSV, (ctrl+u), and when the adjustment is cancelled.
For a single document it is reproducible until either the document or Krita is
closed. It is destructive to the layer, not visual only.

OBSERVED RESULT
Square created on adjusted layer, destroying content.

EXPECTED RESULT
No square created.

SOFTWARE VERSIONS
Qt Version: 5.11.2-1
nvidia: 340xx
i3wm on xorg: 4.15
compton: 2.0

ADDITIONAL INFORMATION
>From observation/memory, this has happened only under i3wm/compton. It may be
unrelated to Krita in that case?

It happens most often when HSV sliders are adjusted on a bottom single colored
layer. That could just be because it is what is used most and because the most
pixels are changed when an entire layer that is filled is changed, thus many
updates happening at once. If the adjustment is cancelled the square is of the
color that was last shown in the instant preview.

The square size seems consistent based on past instances. If drawn over the
square, it cannot be undone. The square reappears when using slider or
adjusting colors.

Sorry this isn't much to go on, just thought it should be reported finally as
an instance of the issue has been recorded. No other information on this issue
was able to be found, which lead to the belief of it being related to something
specific in compositing or user configuration.

Hope the video explains what is going on better than text. Will record full
screen if reproducible when not working on a private project.

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