Non-consecutive hyperlink fragments sharing the same "id" should be underlined together. It used to work correctly, but apparently broke at some point.

cat perf/hyperlink-demo.txt

Mouseover "ID of 250 bytes once, twice" (should be underlined at once) or "foobarfoo..." (the last foo lives a separate life) or "http://exa[linewrap]le.com" (should be underlined at once).

0-52 is okay. Since at "foobarfoo..." it's consistently the last "foo" that lives its own separate life, my first suspect is the new parser.