feat: add rootMargin to TableOfContents builder #1210
Merged
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Motivation
TableOfContents interaction observer allows passing in scroll offset, which can be used to account for fixed/sticky headers when scrolling, but there is no way to cater for that in interaction observer.
Changes
This PR adds a rootMargin argument for TableOfContents builder, which is then passed to the InteractionObserver constructor, thus catering for viewport customisation and use cases like fixed headers/footers.