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https://issues.apache.org/jira/browse/FOP-2522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727040#comment-14727040
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Björn Kautler commented on FOP-2522:
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Further characters where I have seen it happen:
- Solidus (http://decodeunicode.org/u+002F)
- CRLF (http://decodeunicode.org/u+000D + http://decodeunicode.org/u+000A)
- Question Mark (http://decodeunicode.org/u+003F)
- Right curly bracket (http://decodeunicode.org/u+007D)
> 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
>
> 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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