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https://issues.apache.org/jira/browse/PDFBOX-4951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17190761#comment-17190761
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Tilman Hausherr commented on PDFBOX-4951:
-----------------------------------------

Here's how it looks in NOTEPAD++, the glyphs are isolated. How would we know 
that they are to be combined? And what would be do if we don't want them to be 
combined?
 !screenshot-1.png! 

> Sequences with combining letters are rendered incorrectly
> ---------------------------------------------------------
>
>                 Key: PDFBOX-4951
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4951
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.21
>            Reporter: Volker Kunert
>            Priority: Major
>         Attachments: DIN_SPEC_91379_Sequences-aa.pdf, 
> DIN_SPEC_91379_Sequences-ab.pdf, DIN_SPEC_91379_Sequences-ac.pdf, 
> DIN_SPEC_91379_Sequences.txt, TestPdfbox.java, pdfbox.pdf, screenshot-1.png
>
>
> Accented Letters composed of Unicode base letter and combining accent are 
> rendered wrong. E.g. with 0041 030B LATIN CAPITAL LETTER A WITH COMBINING 
> DOUBLE ACUTE ACCENT the accent appears at the right hand side of the letter 
> A, not above the letter A.
> The position is wrong for most of the sequences defined in the following spec:
> DIN SPEC 91379: Characters in Unicode for the electronic processing of names 
> and data 
>  exchange in Europe; with digital attachment
>  [https://www.xoev.de/downloads-2316#StringLatin]
>  [https://www.din.de/de/wdc-beuth:din21:301228458]
>  
> The correct rendering should look like the output of hb-view 2.6.8, see files 
> DIN_SPEC_91379_Sequences*.pdf.
> The output of PDFBox is appended in pdfbox.pdf, which is created by running 
> TestPdfbox.java. The sequences are read from file 
> DIN_SPEC_91379_Sequences.txt.
>  
> Font used for testing: NotoSansMono-Regular.ttf, see 
> [https://www.google.com/get/noto/] 
> download: 
> [https://noto-website-2.storage.googleapis.com/pkgs/NotoSansMono-hinted.zip]
>  See also FOP-2969
>  



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