Use separate materials for widget layers
Summary of Changes Introduced
- Fix a bug where foreground and background images would be shared
PR Checklist
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I have documented any user-visible changes to the code in the documentation folder -
I agree that the changes introduced in this PR are licensed under the LGPL-3.0 license (Why?) -
I have added applicable tests, or at least not introduced any failures
Closes #386 (closed)