feat(msexcel): ignore invisible sheet

[ealyn]

As WYSIWYG, filter invisible sheets.

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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[PeterStaar-IBM]

@ealyn I would be more in favor to not skip the invisible_sheet, but rather updeate the ContentLayer (eg set it to background instead of the default body).

see:

1. ContentLayer (https://github.com/docling-project/docling-core/blob/cacf4ef67b902d14298b67dc7c84ca2a59be337f/docling_core/types/doc/document.py#L731)
2. add_text (https://github.com/docling-project/docling-core/blob/cacf4ef67b902d14298b67dc7c84ca2a59be337f/docling_core/types/doc/document.py#L731)

[ealyn]

@PeterStaar-IBM The meaning is slightly different between background and invisible sheet. Offer a new ContentLayer member would be better.

[PeterStaar-IBM]

@PeterStaar-IBM The meaning is slightly different between background and invisible sheet. Offer a new ContentLayer member would be better.

I agree, just added extra content-layers to address this: docling-project/docling-core#345

[PeterStaar-IBM]

@ealyn We just merged another content-layer "INVISIBLE". If you add this and do the code reformatting, we would be happy to merge!

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/backend/msexcel_backend.py	50.00%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[ceberam]

@ealyn do you have any update on this PR?
As mentioned by @PeterStaar-IBM , docling-core is now supporting the invisible content layer, so the changes needed in the PR should be straightforward.
Let us know if you need any support for finalizing it.

[ealyn]

@ceberam Just because I'm busy in july, I'll refactor this feature in august.