failing test case for commonmark output with Escaped nodes.

[kivikakk]

In an input sequence like \™, with Escaped nodes left in (where a user asks for them to be), the CommonMark formatter can't see that & is followed by alpha (since the & is in an isolated node), so it doesn't think it needs escaping.

I've given this a few tries, but obvious solutions are not as easy as one would think.

[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
./bench.sh ./comrak-1358bdf	106.5 ± 4.6	104.2	129.1	1.82 ± 0.08
./bench.sh ./comrak-main	105.3 ± 1.1	103.8	108.6	1.80 ± 0.03
./bench.sh ./pulldown-cmark	58.5 ± 0.8	57.6	60.9	1.00
./bench.sh ./cmark-gfm	90.2 ± 7.8	81.6	105.1	1.54 ± 0.14
./bench.sh ./markdown-it	255.1 ± 2.6	250.2	261.4	4.36 ± 0.08

Run on Sun Nov 2 06:55:06 UTC 2025