Feature: support rendering of line between columns #2067
Description
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
- Open attached docx in SuperDoc.
- 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
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Ref: SD-1655