Preserve links when markup is being truncated/linebroken

[ShaunLawrie]

fixes #363

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• I have commented on the issue above and discussed the intended changes
• A maintainer has signed off on the changes and the issue was assigned to me
• All newly added code is adequately covered by tests
• All existing tests are still running without errors
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Changes

This doesn't fix the ID issues talked about in the original issue, only the link target being incorrect when the segment is split over multiple lines or truncated and the link is to be generated via the text e.g. [link]https://example.com[/].

Attempting to share a link ID over these portions makes things much more complex and the end result is just that the link will have a correct hover effect on some terminals. This could be addressed in a separate change.

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