Fix broken read-only form field mechanism in submission forms

[kskaiser]

References

• Fixes broken read-only form field mechanism #116

Description

The read-only visibility mechanism for submission form fields was not working, as references to SectionVisibility attributes (main, other) remained after its removal in DSpace CRIS 2024.02.00.

Instructions for Reviewers

This fix adapts the relevant checks in field-parser.ts and adds the missing import required for correct handling of SubmissionVisibility.

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