[Bug 53662] New: docbook footnote and body text overlap (example fo file included)

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=53662

          Priority: P2
            Bug ID: 53662
          Assignee: fop-dev@xmlgraphics.apache.org
           Summary: docbook footnote and body text overlap (example fo
                    file included)
          Severity: normal
    Classification: Unclassified
                OS: Linux
          Reporter: pere@hungry.com
          Hardware: PC
            Status: NEW
           Version: 1.0
         Component: page-master/layout
           Product: Fop

Created attachment 29172
  --> https://issues.apache.org/bugzilla/attachment.cgi?id=29172&action=edit
fo file triggering the bug

I discovered this problem with the fop backend of xmlto when using it
to create a PDF.  The docbook document in question is rather large,
but I managed to extract an except demonstrating the problem.  The
problem is that the footnote text and the body text overlap.  I
initially reported it to Debian as
<URL: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683197 > but
thought it best to report it here too.  The docbook source and the
generated PDF is attached to the Debian bug report.  Notice in the
example how the text of the footnote on the second to last page is
overlapping with the body.

I generated the PDF using this command:

  xmlto --noautosize -m xmlto-pdf.xsl --with-fop pdf bad-footnote.xml

The full document set is available from
<URL: https://github.com/petterreinholdtsen/free-culture-lessig >, if
you want to check it out.

When I investigated some more, I concluded that the problem is with
the fop processor, not xmlto.  The problem exist in both fop versions
1:0.95.dfsg-11 and 1:1.0.dfsg2-6 in Debian.  The fo code generated by
xmlto include the footnote content as it should, and when I manually
process the .fo file using fop, the resulting PDF have the overlapping
text.

I am attaching the .fo file I used to test this, to allow you to
reproduce the problem and try to find a fix. :)

Could this be the same problem reported in
<URL: https://issues.apache.org/bugzilla/show_bug.cgi?id=51304 >

This issue make fop useless for making the PDF version of the Free
Culture book. :(

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[Bug 53662] docbook footnote and body text overlap (example fo file included)

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=53662

--- Comment #1 from Pascal Sancho <ps...@gmail.com> ---
Hmm,
Tried unsuccessfully to isolate what give this issue in the attached FO.
IMHO, a possible cause is the b-p-d conversion to millipoint that is rounded
(because integer), while original values are float. But that needs to be
checked deeper.
Changing anything that impacts the b-p-d position of footnote area causes a
page break at the right place.

For instance, a simple workaround here is to remove
line-height-shift-adjustment from fo:root, and FOP becomes "magic"...

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