Jan Tošovský updated FOP-1760:
    Attachment: patch_against_rev_1690781_2015-07-19.patch

Patch derived from Stephan work, covering several corner cases:
+ fixing change bars rendering in multi-column layouts
+ handling overlapping change bars
+ change bar support for entire table cells
+ fixing y-offset for table change bars
(+ providing set of layout tests)
(+ renaming variables and methods)

While placement of change bars is ready for both LR/RL directions, as the 
actual value is unknown inside AbstractRenderer.renderMainReference() method, 
it is currently hardcoded to LR one. 

Depends on FOP-2501 and FOP-2502

Known issue: When drawing change bars for consecutive lines, the change bars 
are drawn with the same height as the line area, causing gaps between the 
change bars (as lines are offset).

> [PATCH] FOP doesn't support change bar generation
> -------------------------------------------------
>                 Key: FOP-1760
>                 URL: https://issues.apache.org/jira/browse/FOP-1760
>             Project: FOP
>          Issue Type: Bug
>          Components: unqualified
>    Affects Versions: trunk
>         Environment: Operating System: All
> Platform: All
>            Reporter: Stephan Thesing
>         Attachments: change-bars.fo, change_bars_diff.txt, changebar.diff, 
> changebar_20110308.diff, changebars.fo, changebars.pdf, 
> changebars_20110512.diff, diff_1691612.diff, diff_2010_03_06.txt, 
> fop_20120507.diff, fop_changebars_20120506.diff, 
> patch_against_rev_1686494_2015-06-19.patch, 
> patch_against_rev_1690781_2015-07-19.patch, test.fo, test.pdf
> In order to produce change bars along the columns for changed contents,
> FO supports the fo:change-bar-begin and fo:change-bar-end elements.
> These are not supported by FOP.
> Support for change bars should be added.
> Effort needed
>  - add parsing and validation of fo: elements
>  - determine fo elements under influence of one or more change bars
>  - when creating areas from such affected fo elements, create additional areas
>     representing the change bars as defined in the FO standard.

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