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https://issues.apache.org/jira/browse/FOP-1749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776489#comment-13776489
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Alexey Neyman commented on FOP-1749:
------------------------------------

Hi Vincent,

This is the separate issue I mentioned above: it does appear in the Area Tree, 
but the footnote has
incorrect top-offset value (bpd size of the viewport/region is 50000):

<footnote top-offset="38000">
  <block ipd="240000" bpd="12000" ipda="240000" bpda="32000" bap="0 0 0 0" 
space-before="20000">

This happens even if footnote splitting is not considered, i.e. when this 
infinite loop is not
triggered, both with and without this patch - which is why I believe this is a 
separate issue.
I think it's probably a bug somewhere in addAreas, but I am yet to look at that 
code.

As to the glue: as I indicated in the comment, above, this glue element is 
following a dummy box
(one with zero width). As far as I understand, this is FOP's way of describing 
a retained space
at the beginning of a sequence. Would it be more appropriate instead to set 
boxPreceding to true
only for boxes of non-zero width, as follows?

                    if (element.isBox()) {
                        // element is a box
                        splitLength += element.getWidth();
                        if (splitLength > prevSplitLength) {
                            // and it is non-empty
                            boxPreceding = true;
                            somethingAdded = true;
                        }
                    } else if (element.isGlue()) {
                        // element is a glue
                        if (boxPreceding) {
                            // end of the sub-sequence
                            index = noteListIterator.previousIndex();
                            break;
                        }
                        boxPreceding = false;
                        splitLength += element.getWidth();
                    } else {


And by the way, could you also review/check in the patch in FOP-2106, another
footnote-related issue?
                
> [PATCH] infinite loop in footnotes (see also #47424)
> ----------------------------------------------------
>
>                 Key: FOP-1749
>                 URL: https://issues.apache.org/jira/browse/FOP-1749
>             Project: Fop
>          Issue Type: Bug
>          Components: page-master/layout
>    Affects Versions: trunk
>         Environment: Operating System: Windows XP
> Platform: PC
>            Reporter: Heidi Vanparys
>         Attachments: bug47424.patch, c.fo, fop-1749.diff
>
>
> This patch solves the problem of an infinite loop in footnotes as reported in 
> FOP-1678.
> The infinite loop occurred in 
> org.apache.fop.layoutmgr.PageBreakingAlgorithm.getFootnoteSplit(int, int, 
> int, int, boolean).
> This patch does not solve the problem of another infinite loop in footnotes 
> as reported in bugs 48063 and 48162. This infinite loop occurs in 
> org.apache.fop.layoutmgr.PageBreakingAlgorithm.createFootnotePages(KnuthPageNode).
>  The test attached to 48063 is converted to a testcase and added to the list 
> of disabled testcases.

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