Added the InvisibleTextItem

[PeterStaar-IBM]

Project

Adding the ability to add Invisible text.

Resolves/Required by

1. feat: Add PPTX notes slides docling#474
2. Support for capturing Word document comments (e.g., reviewer comments or annotations added in Microsoft Word) docling#485

[PeterStaar-IBM]

@vagenas can you add the issue wrt word comments?

[vagenas]

It was not a GitHub issue, but rather an internal discussion — shared it privately now 😉

[cau-git]

I would not introduce an additional dimension just forInvisibleTextLabel, let's avoid to have a second-level dependency to DocItemLabel.INVISIBLE_TEXT, and just put straight:

DocItemLabel.COMMENT # For speech-bubble comments where supported (we could enable it for some backends)
DocItemLabel.NOTE # For author or slide notes

as regular labels. Then, we can add these to the furniture (same as for heading or footers) and enable that the furniture can be iterated over together with the rest.

[mergify]

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[cau-git]

Agreements from discussion:

• There should be no third category of labels.
• Things like slide comments, Word review comments, etc. should go into the furniture root and be put inside a group with new GroupLabel.COMMENT_SECTION
• Optional: We can extend the type hierachy with a CommentItem, which additionally stores an author name and timestamp with the text.
• We must add filter argument for group labels on the export functions (additional to DocItemLabels)