ID 357030 - Backdrop Item images in use are inadvertently purged by Scene Cleanup command.

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Problem summary
"Scene Cleanup" command doesn't register images as 'used' when they are being used for Backdrop items. As a result these images are purged from the scene.

Customer reported version
modo.12.1v1

Customer reported platform
windows10

Steps to reproduce

1) In the Item List, create a Backdrop Item.

2) In the Backdrop Item's properties, load an image file.

3) In the top menu bar, navigate to Item > Scene Cleanup. The Scene Cleanup options will appear in a dialog window - ensure "Purge unused Images" is checked and click OK. The image file being used by the Backdrop Item will be purged.

Workaround
n/a

Reproduced by support
This bug has been reproduced in:
Windows 10
12.1v1
12.0v1
11.2v3
11.2v1


macOS
12.1v1
11.2v1

Earliest version tested
11.2v1 - The "Scene Cleanup" command did not exist before this version.

Expected behaviour
Images being used by a Backdrop Item should qualify as in use, therefore they should not be purged by the Scene Cleanup command.

Actual behaviour
If an image is being used for a Bakcdrop Item, Scene Cleanup will not register it as in use and it will be purged from the scene.

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