https://bugs.kde.org/show_bug.cgi?id=428038

            Bug ID: 428038
           Summary: Group with two filter mask layers doesn't save layers
                    properly when copied from another file
           Product: krita
           Version: 4.4.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Animation
          Assignee: krita-bugs-n...@kde.org
          Reporter: problem.mach...@gmail.com
  Target Milestone: ---

SUMMARY
Data saved in filter mask layers is often unsaved and these layers do not
remain open in the timeline if the file is reloaded

STEPS TO REPRODUCE
Note: Because of the size limit I cannot attach the affected files directly and
I am finding it difficult to reproduce the problem from scratch. I describe
here how I recreate it locally. File A is a large master animation file with a
few layers of line art and a couple of groups for coloring with each group
containing a filter mask for shadows and a filter mask for highlights. File B
is one shorter animation which I'm trying to import into File A.

1. Open File A in one window and File B in another. Go to frame 488 in File A
and note that the filter mask contains entirely empty keyframes -- a result of
the bug.
2. Select and drag the frames from 16-22 of shadow filter mask of File B to the
frames 488-494 of shadow filter mask in File A; Select and drag the frames from
16-22 of highlight filter mask in File B to the frames 488-494 of highlight
filter mask in File A 
3. Save and reopen File A


OBSERVED RESULT
The shadow filter mask still contains empty keyframes instead of the new data.
Additionally, if Show In Timeline is toggled on either of the filter mask
layers, this information is not saved.

EXPECTED RESULT
New information is expected to be saved

ADDITIONAL INFORMATION
I solved a similar problem with filter mask information not being saved a
little while ago by toggling legacy mode on the layer, so because the behavior
is similar this may be a connected problem. Additionally, the problem did not
occur when I tested only copying the shadow data -- it only happened when I
copied both shadow and highlight filters

Krita

 Version: 4.4.0
 Languages: en_US, en
 Hidpi: true

Qt

  Version (compiled): 5.12.9
  Version (loaded): 5.12.9

OS Information

  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.18363
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10

OpenGL Info

  Vendor:  "Google Inc." 
  Renderer:  "ANGLE (AMD Radeon (TM) R9 380 Series Direct3D11 vs_5_0 ps_5_0)" 
  Version:  "OpenGL ES 3.0 (ANGLE 2.1.0.57ea533f79a7)" 
  Shading language:  "OpenGL ES GLSL ES 3.00 (ANGLE 2.1.0.57ea533f79a7)" 
  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 3.0, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8,
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8,
samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0,
colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::NoProfile) 
     Version: 3.0
     Supports deprecated functions false 
     is OpenGL ES: true 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsAngleD3D11: true 
  isQtPreferAngle: true 

Hardware Information

  GPU Acceleration: auto
  Memory: 16326 Mb
  Number of Cores: 4
  Swap Location: C:/Users/Problemachina/AppData/Local/Temp

Current Settings

  Current Swap Location: C:/Users/Problemachina/AppData/Local/Temp
  Current Swap Location writable: true
  Undo Enabled: true
  Undo Stack Limit: 500
  Use OpenGL: true
  Use OpenGL Texture Buffer: true
  Use AMD Vectorization Workaround: 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: \\.\DISPLAY1
                Depth: 32
                Scale: 2
                Resolution in pixels: 1920x1080
                Manufacturer: 
                Model: 
                Refresh Rate: 60
        Screen: 1
                Name: \\.\DISPLAY2
                Depth: 32
                Scale: 1
                Resolution in pixels: 1920x1080
                Manufacturer: 
                Model: 
                Refresh Rate: 59

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