TestCustomWrap fails with go1.19 about kong HOT 1 CLOSED

As it turns out, as part of the implementation of Russ Cox's Proposal: go/doc: headings, lists, and links in Go doc comments for go1.19, a more advanced wrapping algorithm which

wraps words into lines of at most max runes,
minimizing the sum of the squares of the leftover lengths
at the end of each line (except the last, of course),
with a preference for ending lines at punctuation (.,:;).

is now used. Compare the old algorithm (in go1.18.5):

• https://cs.opensource.google/go/go/+/refs/tags/go1.18.5:src/go/doc/comment.go;l=460-511

with the new one (in go1.19):

• https://cs.opensource.google/go/go/+/refs/tags/go1.19:src/go/doc/comment/text.go;l=181-337

See go/doc/comment: add text wrapping (I07787be3) · Gerrit Code Review

go/doc/comment: add text wrapping

[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]

Implement wrapping of text output, for the “go doc” command.
The algorithm is from D. S. Hirschberg and L. L. Larmore,
“The least weight subsequence problem,” FOCS 1985, pp. 137-143.

For #51082.

Change-Id: I07787be3b4f1716b8ed9de9959f94ecbc596cc43
Reviewed-on: https://go-review.googlesource.com/c/go/+/397283
Run-TryBot: Russ Cox <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Jonathan Amsterdam <[email protected]>

from kong.