Feature: support rendering of line between columns

[caio-pizzol]

Summary

Support rendering the "Line between" separator when a document uses multi-column layouts (w:cols with w:sep or lineBetween attribute in w:sectPr).

Problem

When a DOCX uses columns with the "Line between" setting enabled, the vertical separator line between columns does not render in SuperDoc.

Repro

1. Open attached docx in SuperDoc.
2. The document has two columns with "Line between" enabled.

Expected

A vertical line renders between the columns, matching Word's behavior.

Notes

The setting lives in w:sectPr/w:cols as either a w:sep child element or w:lineBetween attribute. This is a rendering-only change — the column layout itself already works.

Attachments

Column borders (1).docx

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Ref: SD-1655

[linear]

IT-525

[JoaaoVerona]

On it!