[krita] [Bug 486877] New: Transform masks that have never been edited in Krita 5.2 fail to load in 5.3

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=486877

            Bug ID: 486877
           Summary: Transform masks that have never been edited in Krita
                    5.2 fail to load in 5.3
    Classification: Applications
           Product: krita
           Version: git master (please specify the git hash!)
          Platform: Compiled Sources
                OS: macOS
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: * Unknown
          Assignee: krita-bugs-null at kde.org
          Reporter: code at thecodewarrior.dev
  Target Milestone: ---

SUMMARY
In Krita 5.2, transform masks use `dumbparams` until they're first edited. The
parser for those params was moved into a separate library in commit d1cc758,
meaning any files that contain `dumbparams` transform masks fail to load.

STEPS TO REPRODUCE
1. Launch Krita 5.2.2
2. Create a new document
3. Add a transform mask to the background layer
4. Save the file
5. Launch Krita 5.3.0-prealpha (git 17e5603)
6. Try to open the file

OBSERVED RESULT
Krita fails to load the image, complaining it "Could not create transform mask
params"

EXPECTED RESULT
The file should open successfully

SOFTWARE/OS VERSIONS
Krita: 5.3.0-prealpha (git 17e5603)

ADDITIONAL INFORMATION
You can observe the param type changing using this script:
    doc = Krita.instance().activeDocument()
    print(doc.activeNode().toXML())

1. Launch Krita
2. Create a new document
3. Add a transform mask to the background layer
4. Run the script
5. Start editing the mask
6. Run the script again

In 5.2, the mask starts out using `dumbparams`, then moves to
`tooltransformparams` when you edit the transform. If you perform those same
steps in 5.3 the transform mask immediately uses `tooltransformparams`.

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