https://bugs.kde.org/show_bug.cgi?id=372677

            Bug ID: 372677
           Summary: Perspective transform loses entire layer content for
                    full document layers
           Product: krita
           Version: 3.1 Beta
          Platform: Windows CE
                OS: Windows CE
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: transform
          Assignee: krita-bugs-n...@kde.org
          Reporter: asta...@neverdot.com
  Target Milestone: ---

When using the perspective transform tool on a full page document layer, the
layer content vanishes when a handle is dragged.  If one presses Enter to
accept the transform, it gets stuck at 33%.  It can be worked around by first
using a normal scaling transform, apply it (no size change needed), then use
the perspective transform, which then works.

1. Create a new document
2. Fill the layer with a colour and paint on the top layer a bit
3. Select the transform tool
4. Switch to the perspective transform mode
5. Click on the layer to see the handles
6. Drag one of the corner handles
7. The layer will now vanish, along with the handles and outline
8. Press Enter to accept the transform
9. Note that the transformation progress on the layer gets stuck at 33%

Workaround:
Steps 1-3 normally
4. Select the scale transform
5. Click the layer to see the handles
6. Press Enter to apply this transform (no handles need to be moved)
7. Switch to the perspective transform
8. Click the layer to see the handles
9. Drag the handles and transform in perspective as expected
10. Press Enter to apply the transform, it will complete properly.

A video demonstration of this bug can be found here:

https://www.youtube.com/watch?v=HVJrdqR-6M4

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