Fix edge cases for relaxed-autolink option

[digitalmoksha]

Handle several edge cases with the relaxed-autolinks option when autolinking inside a markdown link. We now detect if it's a single url in a markdown link ([url](url)). We also handle if an autolink does get added to a link by removing the duplicate link when converting to HTML.

Related issue: #459

[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
./bench.sh ./comrak-aef95c6	323.2 ± 1.3	321.4	327.3	2.92 ± 0.02
./bench.sh ./comrak-main	326.6 ± 1.3	325.0	331.5	2.95 ± 0.02
./bench.sh ./pulldown-cmark	110.8 ± 0.5	109.8	111.8	1.00
./bench.sh ./cmark-gfm	118.9 ± 1.3	117.5	122.5	1.07 ± 0.01
./bench.sh ./markdown-it	480.7 ± 4.4	476.2	493.0	4.34 ± 0.04

Run on Mon Aug 26 18:55:08 UTC 2024

[kivikakk]

This fails fuzzing. A minimised all_options test case is here: minimized-from-7305067d8bb96107d864bbcb270f09d57ab62a42.md. Repro with cargo fuzz run all_options minimized-from-7305067d8bb96107d864bbcb270f09d57ab62a42.md.

I assume i + link_end may be zero.

[digitalmoksha]

Thanks @kivikakk, that does seem to be it. I've pushed a change, and am running cargo +nightly fuzz run all_options -j 6

[kivikakk]

LGTM — thanks!

[digitalmoksha]

@kivikakk are you up for publishing a new release?

[kivikakk]

Sure thing; will do so in the next hour or so.

[kivikakk]

It's on crates.io :).

[digitalmoksha]

Thank you! 🙇