Accented Letters composed of Unicode base letter and combining accent are rendered incorrectly.

[vk-github18]

Describe the bug

The position of the accents is incorrect for most of the character sequences
defined in the following specification:

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

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.

To Reproduce
The output of LibrePdf/OpenPdf 1.3.22 is appended in din-spec-91379-openpdf.pdf,
which is created by running OpenPdfTest.java using pdf-form.pdf.

Expected behavior
The correct rendering should look like the output of Harfbuzz hb-view 2.6.8
for din-spec-91379-hb-view-2.6.8.txt, see din-spec-91379-hb-view-2.6.8.pdf.
Harfbuzz uses the info in the OpenType GPOS table for positioning.

Screenshots
none

System (please complete the following information):

• OS: Windows 10
• Used Font: NotoSans, NotoSansMath, see https://github.com/googlefonts/noto-fonts/tree/master/hinted/ttf

Additional context
See also
https://issues.apache.org/jira/browse/PDFBOX-4951
https://issues.apache.org/jira/browse/FOP-2969
https://github.com/googlefonts/noto-fonts/issues/1882

[asturio]

Pull Request are welcome :-) !