https://bugs.kde.org/show_bug.cgi?id=421708

            Bug ID: 421708
           Summary: Some combination of copying, pasting, and saving a new
                    file creates phantom pixels that remain in a .kra file
                    no matter what you do
           Product: krita
           Version: 4.2.9
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: File formats
          Assignee: krita-bugs-n...@kde.org
          Reporter: alphalimata...@runbox.com
  Target Milestone: ---

Created attachment 128561
  --> https://bugs.kde.org/attachment.cgi?id=128561&action=edit
A .kra file where I see the phantom pixels

SUMMARY
I have a workflow that somewhat frequently creates images with "phantom
pixels." These are parts of a drawing that were in my clipboard and which
appear on the canvas, but which can't be deleted. They don't appear as part of
any layer and they can't be removed from the file. I have to make a new file to
get rid of them. The pixels can't be selected or made invisible, but the
eyedropper tool is aware of them. The move tool can't move them, the pixels
appear outside the image when cropping, and they appear in front of every other
layer.

I don't know the exact steps to reproduce this, but I have a file that's in
this corrupted state.

My workflow is generally:

1. Draw in a .kra file over many sessions, filling it with doodles
2. When the file is filled up, go to Save As -> new file, delete all the layers
except the background layer, make a new layer, and keep drawing.

Sometimes I'll select parts of the drawing and cut or copy the pixels and paste
them into the new version of the file, after saving. This is definitely when
the bug happens, but I can't reliably reproduce it. I'm missing some kind of
step.



SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Devuan 
$ cat /etc/os-release 
PRETTY_NAME="Devuan GNU/Linux 3 (beowulf)"
NAME="Devuan GNU/Linux"
VERSION_ID="3"
VERSION="3 (beowulf)"
VERSION_CODENAME=beowulf
ID=debian
ID_LIKE=debian
HOME_URL="https://www.devuan.org/";
SUPPORT_URL="https://devuan.org/os/community";
BUG_REPORT_URL="https://bugs.devuan.org/";

$ krita --version
krita 4.2.9

$ dpkg -l | grep plasma-framework
ii  plasma-framework                                   5.54.0-1                
           amd64        Plasma Runtime components


$ dpkg -l | grep libqt5core
ii  libqt5core5a:amd64                                 5.11.3+dfsg1-1          
           amd64        Qt 5 core module


This has happened on Debian as Ubuntu as well, at least as far back as Krita
4.1.5

The attachment demonstrates two separate instances of this happening in one
file. I had pixel data in my clipboard that shows text that says "3/24/20 09:32
PM" (for an unrelated reason), and then last night a doodle. Whatever I try I
can't get these drawings out of the image, including deleting layers, adding
them, etc.

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