https://bugs.kde.org/show_bug.cgi?id=443559

            Bug ID: 443559
           Summary: Crash with a 'repaired' corrupted .kra file
           Product: krita
           Version: nightly build (please specify the git hash!)
          Platform: Debian stable
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: * Unknown
          Assignee: krita-bugs-n...@kde.org
          Reporter: ahab.greybe...@hotmail.co.uk
  Target Milestone: ---

SUMMARY
A user had a corrupted .kra file after Command+S saving, then there was a
crash.
The .kra file and its backup file could not be opened with the error message:
"The file does not exist..... Could not find root"

More details here:
https://krita-artists.org/t/help-krita-could-not-open-file-reason-the-file-doesnt-exist-could-not-find-root/30120/

A repair attempt, using ZipRepair gives a 'recovered' file that will crash the
4.4.8, 5.0.0-beta2 and the Oct 09 5.1.0-prealpha (git 45ea106) appimages on
Debian 10 MATE.

The backup .kra file (renamed from Altha.kra~) and its 'recovered' form are
attached.

When opened with the Oct 10 5.1.0-prealpha (git 45ea10672d) portable .zip
running on Windows 10, there is no crash but it can't be opened with the error
message:
"The file format cannot be parsed
Parsing error in root at line 31, column 28
Error message: unexpected character"

STEPS TO REPRODUCE
1. Open Altha-backup.kra
2. Use ZipRepair in an attempt to repair/recover it.
3. Open recovered-Altha-backup.kra

OBSERVED RESULT
1. It can't be opened. "The file does not exist..... Could not find root"
2. ZipRepair reports much repairing.
3. Instant crash.
There was no relevant log entry apart from 
"KRITA DID NOT CLOSE CORRECTLY"
The Terminal said "Segmentation fault".

EXPECTED RESULT
3. Error message - No Crash

SOFTWARE/OS VERSIONS
Krita

 Version: 5.1.0-prealpha (git 45ea106)
 Languages: en_GB, en, en, en_GB, en
 Hidpi: false

Qt

  Version (compiled): 5.12.11
  Version (loaded): 5.12.11

OS Information

  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: linux
  Kernel Version: 4.19.0-17-amd64
  Pretty Productname: Debian GNU/Linux 10 (buster)
  Product Type: debian
  Product Version: 10
  Desktop: MATE

OpenGL Info

  Vendor:  "NVIDIA Corporation" 
  Renderer:  "GeForce GTX 750 Ti/PCIe/SSE2" 
  Version:  "4.6.0 NVIDIA 460.73.01" 
  Shading language:  "4.60 NVIDIA" 
  Requested format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CompatibilityProfile) 
  Current format:    QSurfaceFormat(version 4.6, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CompatibilityProfile) 
     Version: 4.6
     Supports deprecated functions true 
     is OpenGL ES: false 
  supportsBufferMapping: true 
  supportsBufferInvalidation: true 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsOpenGLES: true 
  isQtPreferOpenGLES: false 

useBufferInvalidation (config option): false


Hardware Information

  GPU Acceleration: auto
  Memory: 16039 Mb
  Number of Cores: 8
  Swap Location: /tmp

Current Settings

  Current Swap Location: /tmp
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 30
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Disable Vector Optimizations: false
  Disable AVX Optimizations: false
  Canvas State: OPENGL_SUCCESS
  Autosave Interval: 900
  Use Backup Files: true
  Number of Backups Kept: 1
  Backup File Suffix: ~
  Backup Location: Same Folder as the File
  Backup Location writable: false
  Use Win8 Pointer Input: false
  Use RightMiddleTabletButton Workaround: false
  Levels of Detail Enabled: false
  Use Zip64: false


Display Information
Number of screens: 2
        Screen: 0
                Name: DVI-D-1
                Depth: 24
                Scale: 1
                Resolution in pixels: 1280x1024
                Manufacturer: Dell Inc.
                Model: DELL 1704FPV-
                Refresh Rate: 60
        Screen: 1
                Name: DVI-D-0
                Depth: 24
                Scale: 1
                Resolution in pixels: 1280x1024
                Manufacturer: Dell Inc.
                Model: DELL 1704FPV-
                Refresh Rate: 60



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