fixes #2030 (not creating links at line starts) while not breaking #2122, for most common use case #2374
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Issue #2030 was fixed by #2104, but then had to be reverted because the solution cause #2122.
This PR fixes the original issue, without introducing the problem in #2122, for the most common case: a
<p>@user ...
or<p>#123 issue ...
.While other breaking edge cases exist (e.g., if someone has already embedded a
<p>@user</p>
inside an anchor tag or some such), those strike me as unlikely practically and, if they did become prevalent, indicating more fundamental refactor (e.g. to xpath-style approaches).