[jira] [Comment Edited] (FOP-2402) footnotes overlap regular content

["Andreas L. Delmelle (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FOP-2402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15141518#comment-15141518 ] 

Andreas L. Delmelle edited comment on FOP-2402 at 2/12/16 6:50 PM:
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More info:
As I was playing with the sample, trying to reduce it further to the absolute minimum required to trigger the bug, I noticed that the nested list structure is also a factor, i.e. removing the outer list also resolves the spacing issue. Using either a regular block or a table instead of a list, the issue cannot be reproduced.
All the space specifiers can be removed, save for those on the list-items.

Guess it will be key to determine exactly what differs in processing between a plain one level list, and a nested list structure, where one list is an item in the other.

EDIT - In the meantime, I have traced said difference to the space adjustment ratio that is used when adding the areas. The page-breaks themselves are computed using the optimum space, so nothing wrong there, but it is only when adding the areas that the space is stretched, based on the adjustment ratio assigned to the break possibility.
For some reason -- I am not quite there yet -- that ratio, in case of a nested list, is 1.0, which results in the full amount of stretch being applied. This basically comes down to: space-before.maximum is used.
When the outer list is removed, the adjustment ratio when adding the areas for that same list item is only 0.05, which results in a much smaller stretch, which makes everything fit nicely.

Still TODO: dive deeper in the page-breaking algorithm to find out why exactly this adjustment ratio is much higher in case the list is nested.


was (Author: adelmelle):
More info:
As I was playing with the sample, trying to reduce it further to the absolute minimum required to trigger the bug, I noticed that the nested list structure is also a factor, i.e. removing the outer list also resolves the spacing issue. Using either a regular block or a table instead of a list, the issue cannot be reproduced.
All the space specifiers can be removed, save for those on the list-items.

Guess it will be key to determine exactly what differs in processing between a plain one level list, and a nested list structure, where one list is an item in the other.

> footnotes overlap regular content
> ---------------------------------
>
>                 Key: FOP-2402
>                 URL: https://issues.apache.org/jira/browse/FOP-2402
>             Project: FOP
>          Issue Type: Bug
>          Components: layout/block
>    Affects Versions: trunk
>         Environment: Ubuntu 14.04, Java 1.7.0_55
>            Reporter: Alexey Neyman
>         Attachments: FOP-2402.fo, FOP-2402.pdf, bad.fo, bad.pdf, footnotes-fit.pdf
>
>
> We've noticed yet another issue with the rendering of the footnotes where the footnote is rendered over the regular content. Verified with top-of-trunk FOP, r1615966. Please refer to the attached FO/PDF files.
>  
> Curiously, if the last fo:list-item is commented out, the preceding fo:list-items are placed more tightly and as a result, the footnotes do not overlap with the regular content. This suggests that there's a bug in how the space between blocks is calculated, but I haven't debugged it further yet.



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