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https://issues.apache.org/jira/browse/FOP-2522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17807729#comment-17807729
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Björn Kautler commented on FOP-2522:
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Probably because that is exactly what a soft hyphen is for?
[https://en.wikipedia.org/wiki/Soft_hyphen]
{quote}In computing and typesetting, a *soft hyphen* [...] or *syllable hyphen*
[...], abbreviated {*}SHY{*}, is a code point reserved in some [coded character
sets|https://en.wikipedia.org/wiki/Coded_character_set] for the purpose of
breaking words across lines by inserting visible
[hyphens|https://en.wikipedia.org/wiki/Hyphen] if they fall on the line end but
remain invisible within the line
{quote}
So it should never be shown within a line, but when needed at that spot the
text can be split at the line-end and the hyphenation character shown.
With a ZWSP it would probably break, but not show the hyphenation character.
Also with a ZWSP other tools would consider left and right part two words,
while with "SHY" it really is one word with markers where the word could be
split at line-end.
If you add a bit more to the test like a very long line of "asdf" followed by
"SHY" repeated wihtout other spaces, so {{asdf<SHY>asdf<SHY>asdf...}} and then
duplicate the {{fo:block}} and in the second set the {{hyphenation-character}}
attribute to value {{/}} mainly for demonstration purpose, this is the intended
outcome that is also produced with my patch:
!image-2024-01-17-14-42-53-377.png!
while without my patch the actual and undesired outcome is:
!image-2024-01-17-14-46-46-565.png!
So yes, I think it is the right to always suppress it like I did, as it should
be never correct to show a hyphen-minus in place of a SHY which is only a "you
can break the word here" marker.
> [PATCH] Soft hyphens in front of some characters are transformed to
> hyphen-minus
> --------------------------------------------------------------------------------
>
> Key: FOP-2522
> URL: https://issues.apache.org/jira/browse/FOP-2522
> Project: FOP
> Issue Type: Bug
> Affects Versions: 2.0
> Reporter: Björn Kautler
> Priority: Major
> Attachments: issue-2522.fo, issue-2522.patch
>
>
> If you have a verbatim block like {{<programlisting>}} in DocBook, the
> DocBook XSL stylesheets insert many soft hypens
> (http://decodeunicode.org/u+00AD) into the content to show where the
> FO-processor may insert linebreaks. By default after spaces and non-breakable
> spaces, but configurable also after arbitrary other characters.
> Unfortunately it seems FOP does not handle the soft hyphens correctly,
> depending on the character that follows it. Soft Hyphens in front of some
> characters are transformed to hyphen-minus, no matter what
> hyphenation-characters is configured and even if the occurence is within a
> line and not at line break.
> I've observed this behaviour with soft hyphens in front of apostrophe
> (http://decodeunicode.org/u+0027), quotation mark
> (http://decodeunicode.org/u+0022), hyphen-minus
> (http://decodeunicode.org/u+002D) and full stop
> (http://decodeunicode.org/u+002E)
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