https://bugs.kde.org/show_bug.cgi?id=503611

            Bug ID: 503611
           Summary: Transform Mask get corrupted when the group's content
                    is transformed by Transform Tool
    Classification: Applications
           Product: krita
           Version: 5.2.9
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Layer Stack
          Assignee: krita-bugs-n...@kde.org
          Reporter: rainco...@gmail.com
  Target Milestone: ---

Created attachment 180846
  --> https://bugs.kde.org/attachment.cgi?id=180846&action=edit
steps to reproduce

SUMMARY
Transform Mask works fine when the group it applies to is the same size or
smaller than the canvas. However, it produces incorrect result when the group
is larger than the canvas.

STEPS TO REPRODUCE
1. Create an empty file.
2. Create a layer and fill its content so it's the exact same size as the
canvas.
3. Put the layer in a group
4. Add a Transform Mask to the group
5. Transform the Transform Mask, for example, scale it down.
6. Select the group, and use Transform Tool to transform the group, for
example, scale it up so the content is outside of the canvas
There are some nuances, so please take a look at the attached screen recording.

OBSERVED RESULT
Very corrupted result.

EXPECTED RESULT
Correct result.

ADDITIONAL INFORMATION
This bug only happens when the Transform Mask is applied to a group. It doesn't
happen to a simple layer. Note that in step 6 we need to transform the group
(not the layer, nor the mask) to trigger this bug.

There was a similar bug here: https://bugs.kde.org/show_bug.cgi?id=427187
But this one only happens with group, so I don't think it's the same bug.

SOFTWARE/OS VERSIONS
Qt
  Version (compiled): 5.15.7
  Version (loaded): 5.15.7

OS Information
  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.19045
  Pretty Productname: Windows 10 Version 2009
  Product Type: windows
  Product Version: 10

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