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https://issues.apache.org/jira/browse/FOP-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355033#comment-15355033
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Radu Coravu commented on FOP-2617:
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Right, I arrived at the same conclusion after 3-4 hours of digging (I'm not 
familiar at all with the code).
Do you have a change recommendation for the ComplexGlyphLayout? So that I can 
create a patch on my side...
If not I will patch the code using your original suggestion of commenting out 
code in the COMPLEX_SCRIPT_TEXT_LAYOUT_FACTORY.

> Text run using "dy" in SVG published to PDF is not properly placed vertically
> -----------------------------------------------------------------------------
>
>                 Key: FOP-2617
>                 URL: https://issues.apache.org/jira/browse/FOP-2617
>             Project: FOP
>          Issue Type: Bug
>          Components: image/svg
>    Affects Versions: 2.1
>            Reporter: Radu Coravu
>             Fix For: trunk
>
>   Original Estimate: 3h
>  Remaining Estimate: 3h
>
> If we have an SVG like:
> {code}<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
> "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd";>
> <svg xmlns="http://www.w3.org/2000/svg"; 
>               width="15.90551in" height="12.93701in"
>               >
>               <g >
>                       <text y="50">A <tspan dy="20">B</tspan></text>          
> </g>
> </svg>{code}
> which gets embedded in an XSL-FO document and then using Apache FOP and Batik 
> we build the PDF, the PDF does not contain the "B" text run on a line under 
> the "A" text run. So it seems to ignore the "dy" attribute set on it.
> Using just Batik to convert the SVG to a binary image works though. So there 
> is probably a problem somewhere in the PDF Graphics 2D or the PDF Text 
> Painter.



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